Fertirelin is a compound with similar structure to gonadotropin-releasing hormone (GnRH) and luteinizing hormone-releasing hormone (LH-RH), and its activity is 2.5 to 10 times that of natural GnRH. This compound is mainly used to study and treat follicular cysts in cattle. It has the ability to reverse follicular cysts and, when used in high doses, can reduce the occurrence of superovulation reactions.