Cats generally enter estrus in the breeding season from spring to autumn, and experience estrus many times a year, usually 2-3 times, sometimes more. This cycle is related to the cat's breed, weight, environment, health and other factors. Generally speaking, the estrus cycle of adult female cats is 5- 14 days. Under normal circumstances, they may enter estrus again every 2-3 weeks. During this period, the cat's impulse is mainly for reproduction, showing a series of obvious external manifestations, such as shouting, jumping around, slimming, rubbing the ground, disturbing the mother cat and owner, etc. In order to prevent unwanted pregnancy and uncontrolled birth, it is suggested that the owner take measures, such as sterilization or contraception.