Men who have sperm that tend to vary in length—particularly in the tail—often have a lower concentration of sperm that can swim well, a possible sign of fertility trouble.
“Our study reveals that men who produce higher concentrations of competent swimming sperm also demonstrate less variation in the size and shape of those sperm,” says Jim Mossman, a postdoctoral scholar at Brown University.
“It suggests that in some cases, testes are working more optimally to produce high numbers of consistently manufactured sperm, and vice versa.”
Full story at Futurity.
More research news from top universities.
Photo credit: Jim Mossman/Brown University