In humans, male fertility and sperm fitness decline with age, but scientists have made the surprising discovery that this pattern is not consistent in other animals. The findings have been published ...

Efficient and reliable semen collection is fundamental to animal breeding, conservation and studies of male fertility. Conventional methods include the use of an artificial vagina (AV) and manual ...

The evolutionary origin of sperm can be traced back to a single-celled ancestor of all living animals. Almost all animals reproduce by having a single-celled stage of their life cycle, involving two ...