Oestrous is a term that refers to the reproductive cycle in mammals, specifically in females. Some synonyms for this word include estrous, fertility cycle, and reproductive cycle. These terms all describe the same process of the cyclic changes that occur in female mammals leading to the ability to conceive and produce offspring. Other related terms include ovulation, menstruation, and fertility. Understanding the importance and patterns of the oestrous cycle is important in animal husbandry, breeding, and reproduction, as well as for understanding the reproductive health of female mammals in general.