News tagged with sperm quality

All sperm are not equal

An experimental study from researchers at Uppsala University provides evidence that in Atlantic salmon, selection acting upon sperm phenotypes within a single ejaculate of a male affects the time until hatching in the resulting ...

Feb 13, 2014
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Big sperm don't always win the race

When females mate with more than one male, each one's sperm has to compete to get to her eggs. Until now, researchers had thought the fastest sperm would dominate.

Jan 31, 2014
4.6 / 5 (5) 0 | with audio podcast

Improving sperm quality in elephants

(Phys.org) —Crushed by habitat loss and poaching, Asian elephants are at risk, and their future rests heavily on captive breeding programs. A collaborative study between Cornell and Smithsonian scientists ...

Nov 27, 2013
1 / 5 (1) 0

Exposure to BPA associated with reduced semen quality

Increasing urine BPA (Bisphenol-A) level was significantly associated with decreased sperm concentration, decreased total sperm count, decreased sperm vitality and decreased sperm motility, according to a Kaiser Permanente ...

Oct 28, 2010
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High levels of cycling training damage triathletes' sperm

The high-intensity training undertaken by triathletes has a significant impact on the quality of their sperm, the 25th annual conference of the European Society of Human Reproduction and Embryology heard today (Monday 29 ...

Jun 29, 2009
5 / 5 (2) 1

Good males are bad fathers

Contrary to predictions, males of high genetic quality are not very successful when it comes to fertilizing eggs. A new study on seed beetles by Swedish and Danish scientists Göran Arnqvist and Trine Bilde shows that when ...

Jun 25, 2009
3.8 / 5 (4) 2