Washington: Men with a wider variation in sperm length may be at risk of infertility as they have lower concentrations of sperm that could swim well, a new study has found. The study shows that greater the inconsistency in the length of sperm, particularly in the tail (flagellum), the lower the concentration of sperm that can swim efficiently. The finding offers doctors a potential new marker for fertility trouble that might trace back to how sperms are being made. "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," said lead author 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," Mossman said in a statement.
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