Cats Menstruation
Cats Menstruation Cats are polyestrous, which means heat cycles happen periodically during their fertile years. 1 These cycles may start as early as four-months-old and will continue until a cat is either bred or spayed. Heat cycles in cats can last several days, up to two weeks, and repeat themselves every two to three weeks. Like most female mammals, cats go through physical cycles that prepare their bodies for fertilization and birth. In humans, this cycle is called "menstruation." In felines, it is called "estrus." When female cats are experiencing estrus they are said to be "in heat" and are hormonally receptive to both intercourse and reproduction. Cats can go into heat in late kittenhood, making it necessary to spay them if a pregnancy, and the responsibility of raising and finding good homes for kittens, is unwanted. Female cats have period cyc...