oestrous cycles, females are generally only sexually active during the oestrus phase of their cycle. This is referred to as being 'in heat'. In contrast...

regulates female characteristics, the maturation of female sex organs and the oestrus and menstrual cycle. It stimulates the production of mammary glands. The...

50 ± 0.13 days. The average duration of oestrus is 18.43 ± 0.11 hours. Oestrous behaviour During the oestrus period, the following behaviors were seen:...

an ovum is not fertilized, the endometrium (uterus lining) is resorbed. Oestrus cycles may occur once or twice a year, or many times a year. Each type...

at about nine months old, and females at about seven months. A female’s oestrus lasts around 36 hours, and gestation lasts 63–68 days. She can give birth...

A cow "bulling" during oestrus....