Sperm Count Has Declined Almost 50% In Men Across The Globe In Recent Decades

Based on a meta-analysis of data from 53 countries across all seven continents, an international collaboration of scientists has shown that sperm counts have continued to decline and even accelerated in some areas, suggesting a worrying downwards trajectory in both fertility and men’s overall health.

According to the study authors, time is running out and the world needs to act fast.

“Our findings serve as a canary in a coal mine,” said Professor Hagai Levine of Hebrew University of Jerusalem’s Hadassah Braun School, in a statement.

“We have a serious problem on our hands that, if not mitigated, could threaten mankind’s survival. We urgently call for global action to promote healthier environments for all species and reduce exposures and behaviors that threaten our reproductive health.”

Alarm bells rang during the pandemic over declining sperm quality, and significant attention was brought to it by the misinformation that the COVID-19 vaccine supposedly affected sperm count and quality. In actuality, infection from COVID-19 did have an effect on this but the vaccine did not, though it did draw scrutiny towards declining sperm counts across men.

In a recent study, a team led by Professor Levine trawled through a diverse set of data from 223 different studies that contain sperm quality data from 1973-2018 and across various different continents, but specifically in continents that were not widely studied before, including South America, Asia and Africa. Covariates were accounted for and analysis performed on the data to look for trends across the board.

The study showed that men in these regions showed similar trends to those found in North America, Europe, and Australia, and that after 2000, the decline in sperm count and concentration accelerated.

“Overall, we’re seeing a significant worldwide decline in sperm counts of over 50 percent in the past 46 years, a decline that has accelerated in recent years,” said Levine.

Unfortunately, all we know from the study is that sperm count is declining, but not why. Levine states that is likely due to a cocktail of lifestyle choices, environmental chemicals, and potential disturbances in reproductive tract development before birth. A huge study in China earlier this year revealed that the large amount of air pollution may be wreaking havoc on sperm count, with people that lived in areas of higher pollution having higher rates of sperm decline.

However, further studies will be needed to uncover the full picture about where the world’s sperm is going.

The study was published in Human Reproduction Update.

https://www.iflscience.com/sperm-count-has-declined-almost-50-in-men-across-the-globe-in-recent-decades-66219

—-

I thought we had already blamed plastics and the pill as urine.

I wonder what other animals sperm counts have changed and by what rate…

sarahs mum said:

… but specifically in continents that were not widely studied before, including South America, Asia and Africa. Covariates were accounted for and analysis performed on the data to look for trends across the board.

The study showed that men in these regions showed similar trends to those found in North America, Europe, and Australia, and that after 2000, the decline in sperm count and concentration accelerated.

Overall, we’re seeing a significant worldwide decline in sperm counts of over 50 percent in the past 46 years, a decline that has accelerated in recent years.

Well, I know mine has.

As you will no doubt know, sperm count depends on temperature. The wearing of clothing, particularly underwear, reduces sperm count. So does heating of buildings and cars, and the tendency towards staying indoors rather than working and playing outdoors increases testicle temperature.

It’s part of the natural process. Sperm count increases when the (specific organisms of) a species are threatened. The more comfortable the lifestyle, the lower the fertility. I’d be very interested to see if there’s a correlation between sperm count and occupation. With higher sperm counts of those in outdoor occupations like farmers, fishermen, construction workers, motorcycle gangs.

As for other animals. I’d expect pet animals to have a lower sperm count than feral animals of the same species.

There are other things I want to say. Particularly as regards “temperature” – purely physical – verses “comfort” – both physical and psychological. Is the effect purely physical or is brain chemistry involved as well? And also as regards species other than animals. Are there records of pollen count from botanists? I vaguely recall that algae tend to reproduce more when their environment turns nasty.

On the other hand, there is a silent killer out there called mutation. When people aren’t killed off by inbreeding, their number of mutations is going to rise silently. The bigger the population, the less the inbreeding, the more recessive mutations build up. And some of those mutations will affect sperm count.

OK, so I’m up to three possible mechanisms for this phenomenon, working alone or together. From most to least likely:
1) Testes temperature.
2) Psychological factors, including distraction and the perception of overpopulation.
3) The rise in recessive mutations.

I wonder if they have tested sperm for microplastics?
They have been accumulatiing in our bodies for some time.

evolution

I very much doubt that air pollution is the problem, since air pollution has greatly reduced in very many countries since the 1950’s.

Moll’s tight fitting underwear + staying inside in over-heated buildings seems a much more likely possibility.

I’d suggest easy access to porn videos + devices to watch them in private was also a significant effect, so quite likely total number of sperm is up, but number per ejaculation is down.

Either way (or both), reducing birth numbers for a century or three would be a very good thing.

every sperm is scared.

Bogsnorkler said:

every sperm is scared.

Actually, most are wasted.

roughbarked said:

Bogsnorkler said:

every sperm is scared.

Actually, most are wasted.

been on the piss all night have they? dirty little stop outs!

“We have a serious problem on our hands”

roughbarked said:

Bogsnorkler said:

every sperm is scared.

Actually, most are wasted.

scarred

As we slowly become extinct we need to reflect on what a privilege it is to be a human and have a life.
Millions, no billions and trillions will never have that opportunity.

Peak Warming Man said:

As we slowly become extinct we need to reflect on what a privilege it is to be a human and have a life.
Millions, no billions and trillions will never have that opportunity.

I’ll always admire your spunk, PWM, it’s been a privilege sailing with you.

dv said:

Peak Warming Man said:

As we slowly become extinct we need to reflect on what a privilege it is to be a human and have a life.
Millions, no billions and trillions will never have that opportunity.

I’ll always admire your spunk, PWM, it’s been a privilege sailing with you.

No worries.

sunk, battleship, something

The Y chromosome is disappearing: What will happen to men?

The Y chromosome may be a symbol of masculinity, but it is becoming increasingly clear that it is anything but strong and enduring. Although it carries the “master switch” gene, SRY, that determines whether an embryo will develop as male (XY) or female (XX), it contains very few other genes and is the only chromosome not necessary for life. Women, after all, manage just fine without one.

What’s more, the Y chromosome has degenerated rapidly, leaving females with two perfectly normal X chromosomes, but males with an X and a shriveled Y. If the same rate of degeneration continues, the Y chromosome has just 4.6m years left before it disappears completely. This may sound like a long time, but it isn’t when you consider that life has existed on Earth for 3.5 billion years.

The Y chromosome hasn’t always been like this. If we rewind the clock to 166m years ago, to the very first mammals, the story was completely different. The early “proto-Y” chromosome was originally the same size as the X chromosome and contained all the same genes. However, Y chromosomes have a fundamental flaw. Unlike all other chromosomes, which we have two copies of in each of our cells, Y chromosomes are only ever present as a single copy, passed from fathers to their sons.

This means that genes on the Y chromosome cannot undergo genetic recombination, the “shuffling” of genes that occurs in each generation which helps to eliminate damaging gene mutations. Deprived of the benefits of recombination, Y chromosomal genes degenerate over time and are eventually lost from the genome.

Despite this, recent research has shown that the Y chromosome has developed some pretty convincing mechanisms to “put the brakes on,” slowing the rate of gene loss to a possible standstill.

For example, a recent Danish study, published in PLoS Genetics, sequenced portions of the Y chromosome from 62 different men and found that it is prone to large scale structural rearrangements allowing “gene amplification“—the acquisition of multiple copies of genes that promote healthy sperm function and mitigate gene loss.

The study also showed that the Y chromosome has developed unusual structures called “palindromes” (DNA sequences that read the same forwards as backwards—like the word “kayak”), which protect it from further degradation. They recorded a high rate of “gene conversion events” within the palindromic sequences on the Y chromosome—this is basically a “copy and paste” process that allows damaged genes to be repaired using an undamaged back-up copy as a template.

Looking to other species (Y chromosomes exist in mammals and some other species), a growing body of evidence indicates that Y-chromosome gene amplification is a general principle across the board. These amplified genes play critical roles in sperm production and (at least in rodents) in regulating offspring sex ratio. Writing in Molecular Biology and Evolution recently, researchers give evidence that this increase in gene copy number in mice is a result of natural selection.

Chromosome Y in red, next to the much larger X chromosome.

On the question of whether the Y chromosome will actually disappear, the scientific community, like the UK at the moment, is currently divided into the “leavers” and the “remainers.” The latter group argues that its defense mechanisms do a great job and have rescued the Y chromosome. But the leavers say that all they are doing is allowing the Y chromosome to cling on by its fingernails, before eventually dropping off the cliff. The debate therefore continues.

A leading proponent of the leave argument, Jenny Graves from La Trobe University in Australia, claims that, if you take a long-term perspective, the Y chromosomes are inevitably doomed—even if they sometimes hold on a bit longer than expected. In a 2016 paper, she points out that Japanese spiny rats and mole voles have lost their Y chromosomes entirely—and argues that the processes of genes being lost or created on the Y chromosome inevitably lead to fertility problems. This in turn can ultimately drive the formation of entirely new species.

https://phys.org/news/2020-07-chromosome-men.html

PermeateFree said:

The Y chromosome is disappearing: What will happen to men?

The Y chromosome may be a symbol of masculinity, but it is becoming increasingly clear that it is anything but strong and enduring. Although it carries the “master switch” gene, SRY, that determines whether an embryo will develop as male (XY) or female (XX), it contains very few other genes and is the only chromosome not necessary for life. Women, after all, manage just fine without one.

What’s more, the Y chromosome has degenerated rapidly, leaving females with two perfectly normal X chromosomes, but males with an X and a shriveled Y. If the same rate of degeneration continues, the Y chromosome has just 4.6m years left before it disappears completely. This may sound like a long time, but it isn’t when you consider that life has existed on Earth for 3.5 billion years.

The Y chromosome hasn’t always been like this. If we rewind the clock to 166m years ago, to the very first mammals, the story was completely different. The early “proto-Y” chromosome was originally the same size as the X chromosome and contained all the same genes. However, Y chromosomes have a fundamental flaw. Unlike all other chromosomes, which we have two copies of in each of our cells, Y chromosomes are only ever present as a single copy, passed from fathers to their sons.

This means that genes on the Y chromosome cannot undergo genetic recombination, the “shuffling” of genes that occurs in each generation which helps to eliminate damaging gene mutations. Deprived of the benefits of recombination, Y chromosomal genes degenerate over time and are eventually lost from the genome.

Despite this, recent research has shown that the Y chromosome has developed some pretty convincing mechanisms to “put the brakes on,” slowing the rate of gene loss to a possible standstill.

For example, a recent Danish study, published in PLoS Genetics, sequenced portions of the Y chromosome from 62 different men and found that it is prone to large scale structural rearrangements allowing “gene amplification“—the acquisition of multiple copies of genes that promote healthy sperm function and mitigate gene loss.

The study also showed that the Y chromosome has developed unusual structures called “palindromes” (DNA sequences that read the same forwards as backwards—like the word “kayak”), which protect it from further degradation. They recorded a high rate of “gene conversion events” within the palindromic sequences on the Y chromosome—this is basically a “copy and paste” process that allows damaged genes to be repaired using an undamaged back-up copy as a template.

Looking to other species (Y chromosomes exist in mammals and some other species), a growing body of evidence indicates that Y-chromosome gene amplification is a general principle across the board. These amplified genes play critical roles in sperm production and (at least in rodents) in regulating offspring sex ratio. Writing in Molecular Biology and Evolution recently, researchers give evidence that this increase in gene copy number in mice is a result of natural selection.

Chromosome Y in red, next to the much larger X chromosome.

On the question of whether the Y chromosome will actually disappear, the scientific community, like the UK at the moment, is currently divided into the “leavers” and the “remainers.” The latter group argues that its defense mechanisms do a great job and have rescued the Y chromosome. But the leavers say that all they are doing is allowing the Y chromosome to cling on by its fingernails, before eventually dropping off the cliff. The debate therefore continues.

A leading proponent of the leave argument, Jenny Graves from La Trobe University in Australia, claims that, if you take a long-term perspective, the Y chromosomes are inevitably doomed—even if they sometimes hold on a bit longer than expected. In a 2016 paper, she points out that Japanese spiny rats and mole voles have lost their Y chromosomes entirely—and argues that the processes of genes being lost or created on the Y chromosome inevitably lead to fertility problems. This in turn can ultimately drive the formation of entirely new species.

https://phys.org/news/2020-07-chromosome-men.html

If push comes to shove and some of us old blokes are called upon, well when duty calls………..

Peak Warming Man said:

PermeateFree said:

The Y chromosome is disappearing: What will happen to men?

The Y chromosome may be a symbol of masculinity, but it is becoming increasingly clear that it is anything but strong and enduring. Although it carries the “master switch” gene, SRY, that determines whether an embryo will develop as male (XY) or female (XX), it contains very few other genes and is the only chromosome not necessary for life. Women, after all, manage just fine without one.

What’s more, the Y chromosome has degenerated rapidly, leaving females with two perfectly normal X chromosomes, but males with an X and a shriveled Y. If the same rate of degeneration continues, the Y chromosome has just 4.6m years left before it disappears completely. This may sound like a long time, but it isn’t when you consider that life has existed on Earth for 3.5 billion years.

The Y chromosome hasn’t always been like this. If we rewind the clock to 166m years ago, to the very first mammals, the story was completely different. The early “proto-Y” chromosome was originally the same size as the X chromosome and contained all the same genes. However, Y chromosomes have a fundamental flaw. Unlike all other chromosomes, which we have two copies of in each of our cells, Y chromosomes are only ever present as a single copy, passed from fathers to their sons.

This means that genes on the Y chromosome cannot undergo genetic recombination, the “shuffling” of genes that occurs in each generation which helps to eliminate damaging gene mutations. Deprived of the benefits of recombination, Y chromosomal genes degenerate over time and are eventually lost from the genome.

Despite this, recent research has shown that the Y chromosome has developed some pretty convincing mechanisms to “put the brakes on,” slowing the rate of gene loss to a possible standstill.

For example, a recent Danish study, published in PLoS Genetics, sequenced portions of the Y chromosome from 62 different men and found that it is prone to large scale structural rearrangements allowing “gene amplification“—the acquisition of multiple copies of genes that promote healthy sperm function and mitigate gene loss.

The study also showed that the Y chromosome has developed unusual structures called “palindromes” (DNA sequences that read the same forwards as backwards—like the word “kayak”), which protect it from further degradation. They recorded a high rate of “gene conversion events” within the palindromic sequences on the Y chromosome—this is basically a “copy and paste” process that allows damaged genes to be repaired using an undamaged back-up copy as a template.

Looking to other species (Y chromosomes exist in mammals and some other species), a growing body of evidence indicates that Y-chromosome gene amplification is a general principle across the board. These amplified genes play critical roles in sperm production and (at least in rodents) in regulating offspring sex ratio. Writing in Molecular Biology and Evolution recently, researchers give evidence that this increase in gene copy number in mice is a result of natural selection.

Chromosome Y in red, next to the much larger X chromosome.

On the question of whether the Y chromosome will actually disappear, the scientific community, like the UK at the moment, is currently divided into the “leavers” and the “remainers.” The latter group argues that its defense mechanisms do a great job and have rescued the Y chromosome. But the leavers say that all they are doing is allowing the Y chromosome to cling on by its fingernails, before eventually dropping off the cliff. The debate therefore continues.

A leading proponent of the leave argument, Jenny Graves from La Trobe University in Australia, claims that, if you take a long-term perspective, the Y chromosomes are inevitably doomed—even if they sometimes hold on a bit longer than expected. In a 2016 paper, she points out that Japanese spiny rats and mole voles have lost their Y chromosomes entirely—and argues that the processes of genes being lost or created on the Y chromosome inevitably lead to fertility problems. This in turn can ultimately drive the formation of entirely new species.

https://phys.org/news/2020-07-chromosome-men.html

If push comes to shove and some of us old blokes are called upon, well when duty calls………..

roger that!

Peak Warming Man said:

PermeateFree said:

The Y chromosome is disappearing: What will happen to men?

The Y chromosome may be a symbol of masculinity, but it is becoming increasingly clear that it is anything but strong and enduring. Although it carries the “master switch” gene, SRY, that determines whether an embryo will develop as male (XY) or female (XX), it contains very few other genes and is the only chromosome not necessary for life. Women, after all, manage just fine without one.

What’s more, the Y chromosome has degenerated rapidly, leaving females with two perfectly normal X chromosomes, but males with an X and a shriveled Y. If the same rate of degeneration continues, the Y chromosome has just 4.6m years left before it disappears completely. This may sound like a long time, but it isn’t when you consider that life has existed on Earth for 3.5 billion years.

The Y chromosome hasn’t always been like this. If we rewind the clock to 166m years ago, to the very first mammals, the story was completely different. The early “proto-Y” chromosome was originally the same size as the X chromosome and contained all the same genes. However, Y chromosomes have a fundamental flaw. Unlike all other chromosomes, which we have two copies of in each of our cells, Y chromosomes are only ever present as a single copy, passed from fathers to their sons.

This means that genes on the Y chromosome cannot undergo genetic recombination, the “shuffling” of genes that occurs in each generation which helps to eliminate damaging gene mutations. Deprived of the benefits of recombination, Y chromosomal genes degenerate over time and are eventually lost from the genome.

Despite this, recent research has shown that the Y chromosome has developed some pretty convincing mechanisms to “put the brakes on,” slowing the rate of gene loss to a possible standstill.

For example, a recent Danish study, published in PLoS Genetics, sequenced portions of the Y chromosome from 62 different men and found that it is prone to large scale structural rearrangements allowing “gene amplification“—the acquisition of multiple copies of genes that promote healthy sperm function and mitigate gene loss.

The study also showed that the Y chromosome has developed unusual structures called “palindromes” (DNA sequences that read the same forwards as backwards—like the word “kayak”), which protect it from further degradation. They recorded a high rate of “gene conversion events” within the palindromic sequences on the Y chromosome—this is basically a “copy and paste” process that allows damaged genes to be repaired using an undamaged back-up copy as a template.

Looking to other species (Y chromosomes exist in mammals and some other species), a growing body of evidence indicates that Y-chromosome gene amplification is a general principle across the board. These amplified genes play critical roles in sperm production and (at least in rodents) in regulating offspring sex ratio. Writing in Molecular Biology and Evolution recently, researchers give evidence that this increase in gene copy number in mice is a result of natural selection.

Chromosome Y in red, next to the much larger X chromosome.

On the question of whether the Y chromosome will actually disappear, the scientific community, like the UK at the moment, is currently divided into the “leavers” and the “remainers.” The latter group argues that its defense mechanisms do a great job and have rescued the Y chromosome. But the leavers say that all they are doing is allowing the Y chromosome to cling on by its fingernails, before eventually dropping off the cliff. The debate therefore continues.

A leading proponent of the leave argument, Jenny Graves from La Trobe University in Australia, claims that, if you take a long-term perspective, the Y chromosomes are inevitably doomed—even if they sometimes hold on a bit longer than expected. In a 2016 paper, she points out that Japanese spiny rats and mole voles have lost their Y chromosomes entirely—and argues that the processes of genes being lost or created on the Y chromosome inevitably lead to fertility problems. This in turn can ultimately drive the formation of entirely new species.

https://phys.org/news/2020-07-chromosome-men.html

If push comes to shove and some of us old blokes are called upon, well when duty calls………..

:) We’d all have our hands up but that may be all we are able to get up.

Bogsnorkler said:

Peak Warming Man said:

PermeateFree said:

The Y chromosome is disappearing: What will happen to men?

The Y chromosome may be a symbol of masculinity, but it is becoming increasingly clear that it is anything but strong and enduring. Although it carries the “master switch” gene, SRY, that determines whether an embryo will develop as male (XY) or female (XX), it contains very few other genes and is the only chromosome not necessary for life. Women, after all, manage just fine without one.

What’s more, the Y chromosome has degenerated rapidly, leaving females with two perfectly normal X chromosomes, but males with an X and a shriveled Y. If the same rate of degeneration continues, the Y chromosome has just 4.6m years left before it disappears completely. This may sound like a long time, but it isn’t when you consider that life has existed on Earth for 3.5 billion years.

The Y chromosome hasn’t always been like this. If we rewind the clock to 166m years ago, to the very first mammals, the story was completely different. The early “proto-Y” chromosome was originally the same size as the X chromosome and contained all the same genes. However, Y chromosomes have a fundamental flaw. Unlike all other chromosomes, which we have two copies of in each of our cells, Y chromosomes are only ever present as a single copy, passed from fathers to their sons.

This means that genes on the Y chromosome cannot undergo genetic recombination, the “shuffling” of genes that occurs in each generation which helps to eliminate damaging gene mutations. Deprived of the benefits of recombination, Y chromosomal genes degenerate over time and are eventually lost from the genome.

Despite this, recent research has shown that the Y chromosome has developed some pretty convincing mechanisms to “put the brakes on,” slowing the rate of gene loss to a possible standstill.

For example, a recent Danish study, published in PLoS Genetics, sequenced portions of the Y chromosome from 62 different men and found that it is prone to large scale structural rearrangements allowing “gene amplification“—the acquisition of multiple copies of genes that promote healthy sperm function and mitigate gene loss.

The study also showed that the Y chromosome has developed unusual structures called “palindromes” (DNA sequences that read the same forwards as backwards—like the word “kayak”), which protect it from further degradation. They recorded a high rate of “gene conversion events” within the palindromic sequences on the Y chromosome—this is basically a “copy and paste” process that allows damaged genes to be repaired using an undamaged back-up copy as a template.

Looking to other species (Y chromosomes exist in mammals and some other species), a growing body of evidence indicates that Y-chromosome gene amplification is a general principle across the board. These amplified genes play critical roles in sperm production and (at least in rodents) in regulating offspring sex ratio. Writing in Molecular Biology and Evolution recently, researchers give evidence that this increase in gene copy number in mice is a result of natural selection.

Chromosome Y in red, next to the much larger X chromosome.

On the question of whether the Y chromosome will actually disappear, the scientific community, like the UK at the moment, is currently divided into the “leavers” and the “remainers.” The latter group argues that its defense mechanisms do a great job and have rescued the Y chromosome. But the leavers say that all they are doing is allowing the Y chromosome to cling on by its fingernails, before eventually dropping off the cliff. The debate therefore continues.

A leading proponent of the leave argument, Jenny Graves from La Trobe University in Australia, claims that, if you take a long-term perspective, the Y chromosomes are inevitably doomed—even if they sometimes hold on a bit longer than expected. In a 2016 paper, she points out that Japanese spiny rats and mole voles have lost their Y chromosomes entirely—and argues that the processes of genes being lost or created on the Y chromosome inevitably lead to fertility problems. This in turn can ultimately drive the formation of entirely new species.

https://phys.org/news/2020-07-chromosome-men.html

If push comes to shove and some of us old blokes are called upon, well when duty calls………..

roger that!

Tri weekly

Try weekly

Try weakly

Bogsnorkler said:

Peak Warming Man said:

PermeateFree said:

The Y chromosome is disappearing: What will happen to men?

The Y chromosome may be a symbol of masculinity, but it is becoming increasingly clear that it is anything but strong and enduring. Although it carries the “master switch” gene, SRY, that determines whether an embryo will develop as male (XY) or female (XX), it contains very few other genes and is the only chromosome not necessary for life. Women, after all, manage just fine without one.

What’s more, the Y chromosome has degenerated rapidly, leaving females with two perfectly normal X chromosomes, but males with an X and a shriveled Y. If the same rate of degeneration continues, the Y chromosome has just 4.6m years left before it disappears completely. This may sound like a long time, but it isn’t when you consider that life has existed on Earth for 3.5 billion years.

The Y chromosome hasn’t always been like this. If we rewind the clock to 166m years ago, to the very first mammals, the story was completely different. The early “proto-Y” chromosome was originally the same size as the X chromosome and contained all the same genes. However, Y chromosomes have a fundamental flaw. Unlike all other chromosomes, which we have two copies of in each of our cells, Y chromosomes are only ever present as a single copy, passed from fathers to their sons.

This means that genes on the Y chromosome cannot undergo genetic recombination, the “shuffling” of genes that occurs in each generation which helps to eliminate damaging gene mutations. Deprived of the benefits of recombination, Y chromosomal genes degenerate over time and are eventually lost from the genome.

Despite this, recent research has shown that the Y chromosome has developed some pretty convincing mechanisms to “put the brakes on,” slowing the rate of gene loss to a possible standstill.

For example, a recent Danish study, published in PLoS Genetics, sequenced portions of the Y chromosome from 62 different men and found that it is prone to large scale structural rearrangements allowing “gene amplification“—the acquisition of multiple copies of genes that promote healthy sperm function and mitigate gene loss.

The study also showed that the Y chromosome has developed unusual structures called “palindromes” (DNA sequences that read the same forwards as backwards—like the word “kayak”), which protect it from further degradation. They recorded a high rate of “gene conversion events” within the palindromic sequences on the Y chromosome—this is basically a “copy and paste” process that allows damaged genes to be repaired using an undamaged back-up copy as a template.

Looking to other species (Y chromosomes exist in mammals and some other species), a growing body of evidence indicates that Y-chromosome gene amplification is a general principle across the board. These amplified genes play critical roles in sperm production and (at least in rodents) in regulating offspring sex ratio. Writing in Molecular Biology and Evolution recently, researchers give evidence that this increase in gene copy number in mice is a result of natural selection.

Chromosome Y in red, next to the much larger X chromosome.

On the question of whether the Y chromosome will actually disappear, the scientific community, like the UK at the moment, is currently divided into the “leavers” and the “remainers.” The latter group argues that its defense mechanisms do a great job and have rescued the Y chromosome. But the leavers say that all they are doing is allowing the Y chromosome to cling on by its fingernails, before eventually dropping off the cliff. The debate therefore continues.

A leading proponent of the leave argument, Jenny Graves from La Trobe University in Australia, claims that, if you take a long-term perspective, the Y chromosomes are inevitably doomed—even if they sometimes hold on a bit longer than expected. In a 2016 paper, she points out that Japanese spiny rats and mole voles have lost their Y chromosomes entirely—and argues that the processes of genes being lost or created on the Y chromosome inevitably lead to fertility problems. This in turn can ultimately drive the formation of entirely new species.

https://phys.org/news/2020-07-chromosome-men.html

If push comes to shove and some of us old blokes are called upon, well when duty calls………..

roger that!

Yeah, I’ll stand in support of that.

I ain’t no spermatologist …

but men produce a million sperm cells per day, typically.

If this average drops to half a million … does it really matter that much? It only takes one … surely a load of half a million is enough to get someone pregnant.

dv said:

I ain’t no spermatologist …

but men produce a million sperm cells per day, typically.

If this average drops to half a million … does it really matter that much? It only takes one … surely a load of half a million is enough to get someone pregnant.

And as every sperm is sacred there is half the population committing a lot less sin.

sibeen said:

dv said:

I ain’t no spermatologist …

but men produce a million sperm cells per day, typically.

If this average drops to half a million … does it really matter that much? It only takes one … surely a load of half a million is enough to get someone pregnant.

And as every sperm is sacred there is half the population committing a lot less sin.

on an ism

dv said:

I ain’t no spermatologist …

but men produce a million sperm cells per day, typically.

If this average drops to half a million … does it really matter that much? It only takes one … surely a load of half a million is enough to get someone pregnant.

if you lose half every fifty years how long is it until men will worry? what if it becomes half every ten years?

dv said:

sibeen said:

dv said:

I ain’t no spermatologist …

but men produce a million sperm cells per day, typically.

If this average drops to half a million … does it really matter that much? It only takes one … surely a load of half a million is enough to get someone pregnant.

And as every sperm is sacred there is half the population committing a lot less sin.

on an ism

:)

sibeen said:

dv said:

sibeen said:

And as every sperm is sacred there is half the population committing a lot less sin.

on an ism

:)

Every Sperm is Sacred

In fertility clinics, they say that you can increase your sperm count by refraining from sex.

So “Half as much sperm” is “Too much sex”.

> The Y chromosome is disappearing: What will happen to men?

I can comment on this because my Chromosome 3 is longer than normal and my Chromosome 14 is shorter than normal.
So I studied up on the topic.

It’s not too unusual for genetic material to jump from one chromosome to another, it happened many times in the transition from Chimps to men. Humans have 46 chromosomes, whereas chimpanzee, gorilla, and orangutan have 48.

The male platypus has five X and five Y chromosomes.

mollwollfumble said:

In fertility clinics, they say that you can increase your sperm count by refraining from sex.

So “Half as much sperm” is “Too much sex”.

> The Y chromosome is disappearing: What will happen to men?

I can comment on this because my Chromosome 3 is longer than normal and my Chromosome 14 is shorter than normal.
So I studied up on the topic.

It’s not too unusual for genetic material to jump from one chromosome to another, it happened many times in the transition from Chimps to men. Humans have 46 chromosomes, whereas chimpanzee, gorilla, and orangutan have 48.

The male platypus has five X and five Y chromosomes.

… or too many ejaculations anyway.

So we should mate with the platypus?

Ogmog said:

sibeen said:

dv said:

on an ism

:)

Every Sperm is Sacred

I’m pretty sure I said this last time I watched that clip, but I’ll say it again anyway.

I’d forgotten how good it is.

The Rev Dodgson said:

Ogmog said:

sibeen said:

:)

Every Sperm is Sacred

I’m pretty sure I said this last time I watched that clip, but I’ll say it again anyway.

I’d forgotten how good it is.

as usual, the Pythons nonsense again makes sense

Ogmog said:

The Rev Dodgson said:

Ogmog said:

Every Sperm is Sacred

I’m pretty sure I said this last time I watched that clip, but I’ll say it again anyway.

I’d forgotten how good it is.

as usual, the Pythons nonsense again makes sense

George Harrison wouldn’t have put all that money in, without adding his tuppence worth.

I imagine quality is more important than quantity.

Not good if you have a lot but they are all Trump’s compared to say less but they are all not Trumps

The Rev Dodgson said:

Ogmog said:

sibeen said:

:)

Every Sperm is Sacred

I’m pretty sure I said this last time I watched that clip, but I’ll say it again anyway.

I’d forgotten how good it is.

as usual, the Pythons’ nonsense again makes sense

Genesis 38:9

Judah and Tamar
(1 Chronicles 2:3–4)

1About that time, Judah left his brothers and settled near a man named Hirah, an Adullamite. 2There Judah saw the daughter of a Canaanite man named Shua, and he took her as a wife and slept with her. 3So she conceived and gave birth to a son, and Judah named him Er. 4Again she conceived and gave birth to a son, and she named him Onan. 5Then she gave birth to another son and named him Shelah; it was at Chezib that she gave birth to him.

6Now Judah acquired a wife for Er, his firstborn, and her name was Tamar. 7But Er, Judah’s firstborn, was wicked in the sight of the LORD; so the LORD put him to death. 8Then Judah said to Onan, “Sleep with your brother’s wife. Perform your duty as her brother-in-law and raise up offspring for your brother.”

9But Onan knew that the offspring would not belong to him; so whenever he would sleep with his brother’s wife, he would spill his seed on the ground so that he would not produce offspring for his brother. 10What he did was wicked in the sight of the LORD, so He put Onan to death as well.

Ogmog said:

The Rev Dodgson said:

Ogmog said:

Every Sperm is Sacred

I’m pretty sure I said this last time I watched that clip, but I’ll say it again anyway.

I’d forgotten how good it is.

as usual, the Pythons’ nonsense again makes sense

Genesis 38:9

Judah and Tamar
(1 Chronicles 2:3–4)

1About that time, Judah left his brothers and settled near a man named Hirah, an Adullamite. 2There Judah saw the daughter of a Canaanite man named Shua, and he took her as a wife and slept with her. 3So she conceived and gave birth to a son, and Judah named him Er. 4Again she conceived and gave birth to a son, and she named him Onan. 5Then she gave birth to another son and named him Shelah; it was at Chezib that she gave birth to him.

6Now Judah acquired a wife for Er, his firstborn, and her name was Tamar. 7But Er, Judah’s firstborn, was wicked in the sight of the LORD; so the LORD put him to death. 8Then Judah said to Onan, “Sleep with your brother’s wife. Perform your duty as her brother-in-law and raise up offspring for your brother.”

9But Onan knew that the offspring would not belong to him; so whenever he would sleep with his brother’s wife, he would spill his seed on the ground so that he would not produce offspring for his brother. 10What he did was wicked in the sight of the LORD, so He put Onan to death as well.

He’s a tough old God.

PermeateFree said:

Ogmog said:

The Rev Dodgson said:

I’m pretty sure I said this last time I watched that clip, but I’ll say it again anyway.

I’d forgotten how good it is.

as usual, the Pythons’ nonsense again makes sense

Genesis 38:9

Judah and Tamar
(1 Chronicles 2:3–4)

1About that time, Judah left his brothers and settled near a man named Hirah, an Adullamite. 2There Judah saw the daughter of a Canaanite man named Shua, and he took her as a wife and slept with her. 3So she conceived and gave birth to a son, and Judah named him Er. 4Again she conceived and gave birth to a son, and she named him Onan. 5Then she gave birth to another son and named him Shelah; it was at Chezib that she gave birth to him.

6Now Judah acquired a wife for Er, his firstborn, and her name was Tamar. 7But Er, Judah’s firstborn, was wicked in the sight of the LORD; so the LORD put him to death. 8Then Judah said to Onan, “Sleep with your brother’s wife. Perform your duty as her brother-in-law and raise up offspring for your brother.”

9But Onan knew that the offspring would not belong to him; so whenever he would sleep with his brother’s wife, he would spill his seed on the ground so that he would not produce offspring for his brother. 10What he did was wicked in the sight of the LORD, so He put Onan to death as well.

He’s a tough old God.

He likes killing babies who did nothing except being born

Cymek said:

PermeateFree said:

Ogmog said:

as usual, the Pythons’ nonsense again makes sense

Genesis 38:9

Judah and Tamar
(1 Chronicles 2:3–4)

1About that time, Judah left his brothers and settled near a man named Hirah, an Adullamite. 2There Judah saw the daughter of a Canaanite man named Shua, and he took her as a wife and slept with her. 3So she conceived and gave birth to a son, and Judah named him Er. 4Again she conceived and gave birth to a son, and she named him Onan. 5Then she gave birth to another son and named him Shelah; it was at Chezib that she gave birth to him.

6Now Judah acquired a wife for Er, his firstborn, and her name was Tamar. 7But Er, Judah’s firstborn, was wicked in the sight of the LORD; so the LORD put him to death. 8Then Judah said to Onan, “Sleep with your brother’s wife. Perform your duty as her brother-in-law and raise up offspring for your brother.”

9But Onan knew that the offspring would not belong to him; so whenever he would sleep with his brother’s wife, he would spill his seed on the ground so that he would not produce offspring for his brother. 10What he did was wicked in the sight of the LORD, so He put Onan to death as well.

He’s a tough old God.

He likes killing babies who did nothing except being born

Well, he has to maintain discipline, otherwise people might forget about him.

PermeateFree said:

Cymek said:

PermeateFree said:

He’s a tough old God.

He likes killing babies who did nothing except being born

Well, he has to maintain discipline, otherwise people might forget about him.

staying in context:
“Well, he has to maintain discipline, otherwise people might forget about him.”

…and what? BECOME TOTAL WANKERS?

Ogmog said:

PermeateFree said:

Cymek said:

He likes killing babies who did nothing except being born

Well, he has to maintain discipline, otherwise people might forget about him.

staying in context:
“Well, he has to maintain discipline, otherwise people might forget about him.”

…and what? BECOME TOTAL WANKERS?

No. Wanking is a big no-no with him.

Tamb said:

Ogmog said:

PermeateFree said:

Well, he has to maintain discipline, otherwise people might forget about him.

staying in context:
“Well, he has to maintain discipline, otherwise people might forget about him.”

…and what? BECOME TOTAL WANKERS?

No. Wanking is a big no-no with him.

Doesn’t seem to stop them.

Tamb said:

Ogmog said:

PermeateFree said:

Well, he has to maintain discipline, otherwise people might forget about him.

staying in context:
“Well, he has to maintain discipline, otherwise people might forget about him.”

…and what? BECOME TOTAL WANKERS?

No. Wanking is a big no-no with him.

Not really. It is only if you’re supposed to be getting your dead brother’s widow pregnant and you decide to do it manually instead. Otherwise it is all fine so long as you don’t have lustful thoughts for your neighbour’s wife while you’re doing it.

party_pants said:

Tamb said:

Ogmog said:

staying in context:
“Well, he has to maintain discipline, otherwise people might forget about him.”

…and what? BECOME TOTAL WANKERS?

No. Wanking is a big no-no with him.

Not really. It is only if you’re supposed to be getting your dead brother’s widow pregnant and you decide to do it manually instead. Otherwise it is all fine so long as you don’t have lustful thoughts for your neighbour’s wife while you’re doing it.

thou shalt not cum into a tissue

Note that the most stable declining statistic is total motile cells produced per day. This will not be affected by freq of ejac.

“Almonds provide a wide arrange of nutrients to support overall health. For men, almonds have been found to optimize sexual health because of their micronutrients properties. Almonds are high in zinc, selenium and vitamin E, which all three are strong antioxidants in protecting cells from free radical damage. They also help improve sperm concentration, sperm motility and testosterone level. The omega 3 and arginine present in almonds are found to enhance circulation and reduce the chance of erectile dysfunction. Almonds are also a great healthy snacks for men who regularly works out. The protein from almonds can help with muscle building and increase bone density.”

I mean if you sat down to a big feed of almonds and a plate of oysters they’d probably lock you up.

Peak Warming Man said:

“Almonds provide a wide arrange of nutrients to support overall health. For men, almonds have been found to optimize sexual health because of their micronutrients properties. Almonds are high in zinc, selenium and vitamin E, which all three are strong antioxidants in protecting cells from free radical damage. They also help improve sperm concentration, sperm motility and testosterone level. The omega 3 and arginine present in almonds are found to enhance circulation and reduce the chance of erectile dysfunction. Almonds are also a great healthy snacks for men who regularly works out. The protein from almonds can help with muscle building and increase bone density.”

I mean if you sat down to a big feed of almonds and a plate of oysters they’d probably lock you up.

I like pushing almonds into pitted dates.

roughbarked said:

Peak Warming Man said:

“Almonds provide a wide arrange of nutrients to support overall health. For men, almonds have been found to optimize sexual health because of their micronutrients properties. Almonds are high in zinc, selenium and vitamin E, which all three are strong antioxidants in protecting cells from free radical damage. They also help improve sperm concentration, sperm motility and testosterone level. The omega 3 and arginine present in almonds are found to enhance circulation and reduce the chance of erectile dysfunction. Almonds are also a great healthy snacks for men who regularly works out. The protein from almonds can help with muscle building and increase bone density.”

I mean if you sat down to a big feed of almonds and a plate of oysters they’d probably lock you up.

I like pushing almonds into pitted dates.

is that when going on a date is just the pits

Almonds are an excellent source of magnesium. There is preliminary research showing that men with magnesium deficiency may have lower testosterone levels. Magnesium helps maintain normal muscle and nerve function, helps cells produce energy and is important for heart and blood vessel health, as well as supporting libido.

Consuming almonds provides nutrients and bioactive molecules like monounsaturated fatty acids, protein, vitamin E, copper, manganese, magnesium, phosphorus, and fiber. The beautiful nutritional composition of almonds helps control blood sugar, helps balance blood pressure, helps reduce cholesterol levels and contributes to bone health.

Almonds are nuts rich in monounsaturated and polyunsaturated fats and vitamin E, which protect our body against non-communicable diseases. Almonds are also a source of magnesium, which is a mineral that may help manage blood sugar levels among people with diabetes. In a scientific study it was showed that the regular consumption of almonds can help lower postprandial glycemia and insulinemia and have a beneficial impact in hormonal, and appetite responses, decreasing hunger and desire to eat in men with type 2 diabetes.

Peak Warming Man said:

Consuming almonds provides nutrients and bioactive molecules like monounsaturated fatty acids, protein, vitamin E, copper, manganese, magnesium, phosphorus, and fiber. The beautiful nutritional composition of almonds helps control blood sugar, helps balance blood pressure, helps reduce cholesterol levels and contributes to bone health.

and with the almond shoved up yer date? What are the extra nutrients involved in this?

Almonds contains nutrients such as vitamin e, zinc and selenium and all this can help to promote the hormonal reproduction and sexual health of men. The nutrients in almond also supports testosterone production. There has been some evidence to show that the arginine found in almonds not only is it good for improving heart health by improving clogged arteries, it can help with erectile dysfunction.

Peak Warming Man said:

Almonds contains nutrients such as vitamin e, zinc and selenium and all this can help to promote the hormonal reproduction and sexual health of men. The nutrients in almond also supports testosterone production. There has been some evidence to show that the arginine found in almonds not only is it good for improving heart health by improving clogged arteries, it can help with erectile dysfunction.

Looks like I’d better mix me almonds with banana?

Peak Warming Man said:

Almonds are nuts rich in monounsaturated and polyunsaturated fats and vitamin E, which protect our body against non-communicable diseases. Almonds are also a source of magnesium, which is a mineral that may help manage blood sugar levels among people with diabetes. In a scientific study it was showed that the regular consumption of almonds can help lower postprandial glycemia and insulinemia and have a beneficial impact in hormonal, and appetite responses, decreasing hunger and desire to eat in men with type 2 diabetes.

Almonds are also a great source of milk.

Woodie said:

Peak Warming Man said:

Almonds are nuts rich in monounsaturated and polyunsaturated fats and vitamin E, which protect our body against non-communicable diseases. Almonds are also a source of magnesium, which is a mineral that may help manage blood sugar levels among people with diabetes. In a scientific study it was showed that the regular consumption of almonds can help lower postprandial glycemia and insulinemia and have a beneficial impact in hormonal, and appetite responses, decreasing hunger and desire to eat in men with type 2 diabetes.

Almonds are also a great source of milk.

Stirrer!

I read none of this thread but have the answer.

Bang twice as much.

Problem solved.