There are three morphs in ruffs that differ in their appearance and mating behavior. Males of the aggressive Independents ...

High-altitude hiking, sleep apnoea and other conditions which deprive a man's testes of oxygen, could be contributing to a ...

That's why the testes hang down, away from the body, for most mammals. So when you wear tight underwear, the resulting increase in temperature can damage the sperm, and potentially your fertility ...

We normally associate high testosterone levels with male dominance and aggression. Among ruffs – a shore bird that breeds across Europe and Asia – ...

The temperature of the testes is at issue: In order for testes to produce sufficient quality and quantity of sperm, the temperature of testes must be lower than the core body temperature.

Two hormones are critical in normal sex differentiation. The testes of normal 46,XY males secrete both Müllerian Inhibiting Substance (also known as MIS or antimüllerian hormone) and ...

Varicocele can cause a sudden temperature rise which severely damages the production of sperm. Extreme temperatures can ...

We normally associate high testosterone levels with male dominance and aggression. Among ruffs – a shore bird that breeds ...