Females of promiscuous species – like the fly pictured here and many others, including our own – often mate with more than one male. As a result, the ejaculate of different males mix in the reproductive tract and the sperm cells compete to fertilise the female
Tag: sperm
Seeking My Anonymous Sperm-Donor Father
A front-page article had hit The New York Times, and I was suddenly spammed by 6,000 well-meaning friends emailing me about DonorSiblingRegistry.com, a website that helps people track down sperm-donor fathers and potential siblings.
Baldness Drug Can Cause Sexual Problems, Infertility and Depression
The drug that treats baldness, Propecia (finasteride) has been shown to cause decreased sperm count levels in a recent study by researchers at Mount Sinai Hospital, Toronto, Ontario, Canada.
Baldness Drug May Depress Sperm Count
Men using finasteride to treat baldness had a dramatic increase in sperm count following discontinuation of the drug, according to a review of records at male infertility clinic.
Finding the Super Sperm in Infertile Men
A NEW technique to identify “super sperm swimmers” has given couples struggling to fall pregnant an Olympic-sized boost. The number of couples resorting to donor sperm has dropped around 30 per cent over the last seven years as a result of the technique, a fertility clinic has claimed.
Japan Scientists Launch Freeze-Dry Animal Sperm Bank
Japanese scientists have launched a sperm bank for endangered animals that uses freeze-drying technology they hope could one day help humans recreate animal populations on other planets, the chief researcher said Wednesday.
Stem Cells: Egg Engineers
In a technical tour de force, Japanese researchers created eggs and sperm in the laboratory. Now, scientists have to determine how to use those cells safely — and ethically.
Study: HPV Found in Sperm; polyDNA Recommends Gene-Eden-VIR Against the Latent HPV
HPV has been found in the sperm of infected men. This can harm a man’s ability to have children. This is particularly true in those who have both HPV (human papillomavirus), which is the most common sexually transmitted viral disease (STD), and Chlamydia trachomatis (Ct), which is the most common bacterial STD.
Fastest Sperm May Not Be The Best
For sea squirts the key to a long and happy life is to be fertilised not by a fast sperm, but by one that stands the test of time, a study has revealed.The research by Dr Angalea Crean, of the UNSW School of Biological, Earth and Environmnetal Sciences also shows for the first time that the influence of sperm extends well beyond the moment of conception. If further studies demonstrate the same effects occur with human sperm, the finding will change some of the assumptions used in IVF practice.
Bill Expanding Sperm Donors’ Parental Rights on Hold
A bill sparked by a custody dispute involving “The Lost Boys” actor Jason Patric that would allow certain sperm donors to seek paternity rights in court is on hold after a legislative hearing Tuesday.