Deslorelin is a synthetic hormone that is used to suppress the reproductive system in animals, particularly in cattle. It works by mimicking the action of progesterone, which is a naturally occurring hormone in females that regulates ovulation and maintains pregnancy. By administering deslorelin, it can help regulate the estrus cycle (heat) in female animals, making them less likely to come into heat or conceive during certain times of the year. This is particularly useful for farmers who want to control the breeding season of their livestock.