Fathers of non-identical twins have better sperm
(ws) Fathers of non-identical twins have better quality sperm than other men, according to a study by Danish fertility specialists. The observation suggests that twinning rates could provide a useful measure of male fertility in a given population.
Earlier research had revealed that men who took longer to father a child were less likely to have non-identical (dizygotic) twins. And some research had hinted that non-identical twins were less common in populations with low male fertility. But there was little or no research on semen quality in fathers of twins, until now. more…
From: »NewScientist.com«