The effects of sex hormones on immune function have received much attention, especially
following the proposal of the immunocompetence handicap hypothesis. Many studies, both …

Females frequently mate with several males, whose sperm then compete to fertilize
available ova. Sperm competition represents a potent selective force that is expected to …

One of the earliest recognized forms of sexual conflict was infanticide by males, which
imposes serious costs on female reproductive success. Here I review two bodies of …

Background Testes size is used as a proxy of male intrasexual competition, with larger
testes indicative of greater competition. It has been shown that in some taxa, social mating …

For the last two decades, behavioral physiologists aimed to explain a plausible covariation
between energetics and personality, predicted by the “pace‐of‐life syndrome”(POLS) …

This study examines the impacts of the urokinase-type plasminogen activator (uPA) on the in
vitro maturation (IVM) of bovine oocytes. Cumulus–oocyte complexes in IVM medium were …

Sperm competition often leads to increase in sperm numbers and sperm quality, and its
effects on sperm function are now beginning to emerge. Rapid swimming speeds are crucial …

Background The degree of postcopulatory sexual selection, comprising variable degrees of
sperm competition and cryptic female choice, is an important evolutionary force to influence …

Sperm viability, acrosome integrity, motility, and swimming velocity are determinants of male
fertility and exhibit an extreme degree of variation among closely related species. Many of …

It has been recently shown in mice that sperm undergo acrosome reaction (AR) by passing
through cumulus cells; furthermore, the acrosome-reacted sperm can bind to zona pellucida …