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PETBioNewsNewsMen have biological clocks too

BioNews

Men have biological clocks too

Published 9 June 2009 posted in News and appears in BioNews 69

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BioNews

Image by Alan Handyside via the Wellcome Collection. Depicts a human egg soon after fertilisation, with the two parental pronuclei clearly visible.
CC0 1.0
Image by Alan Handyside via the Wellcome Collection. Depicts a human egg soon after fertilisation, with the two parental pronuclei clearly visible.

A man's fertility starts to decline from the age of 24, according to a new study carried out by researchers based at the UK's Bristol and Brunel Universities. The scientists found that the older a man is, the longer it will take his partner to conceive, regardless of her age...

A man's fertility starts to decline from the age of 24, according to a new study carried out by researchers based at the UK's Bristol and Brunel Universities. The scientists found that the older a man is, the longer it will take his partner to conceive, regardless of her age. They estimate that the chances of conceiving within six months decrease by two per cent for every year that the man is over 24. Their results are published in the journal Human Reproduction.


The teams used data from the Avon Longitudinal Study of Pregnancy and Childhood (ALSPAC), which was set up to investigate the factors affecting the health and development of thousands of babies born in the area between April 1991 and December 1992. 'It is the first study that demonstrates there is a real decline in fertility as men get older' said Dr Chris Ford, one of the team leaders. He added that paternal age should be another factor to take into account when doctors were looking at treatment options for infertile couples.


Dr Ford said the possible reasons for falling male fertility included reduced production of the hormone testosterone, and environmental factors such as pollution affecting sperm quality. But he stressed that although fertility in both sexes declines with age, 'there is still an 85 per cent chance on average of a couple in their mid-thirties conceiving within a year'.

Related Articles

Image by Peter Artymiuk via the Wellcome Collection. Depicts the shadow of a DNA double helix, on a background that shows the fluorescent banding of the output from a DNA sequencing machine.
CC BY 4.0
Image by Peter Artymiuk via the Wellcome Collection. Depicts the shadow of a DNA double helix, on a background that shows the fluorescent banding of the sequencing output from an automated DNA sequencing machine.
Reviews
15 January 2013 • 3 minutes read

Book Review: History of the Avon Longitudinal Study of Parents and Children, c1980-2000

by Dr Chloe Wong

The Avon Longitudinal Study of Parents and Children (ALSPAC), also known as the Children of the 90s study, is a Bristol University-based project that has followed children born to over 14,000 pregnant women who enrolled between 1991 and 1992. A wealth of health, environmental and lifestyle data, as well as biological samples has been collected by this longitudinal population-based study over the past 21 years...

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