[Endocrine features in the treatment of cystic ovarian follicles in cattle with gonadotrophin-releasing hormone (author's transl)].

Ten animals of the Meuse-Rhine-Yssel breed of cattle, in the thirty-two month to twelve year range, showing cystic ovarian follicles, were treated with intravenous injection of gonadotrophin-releasing hormone (Lutal, Hoechst). All animals responded to treatment with increase in the concentration of luteinizing hormone in the peripheral blood within from 120 to 150 minutes after injection. Luteinizations were observed in the ovaries within from seven to fourteen days after treatment, a process emphasized by increased concentration of progesterone in the blood. Of ten treated animals, six became pregnant. This required a total number of nine injections of gonadotrophin-releasing hormone and seven inseminations. The cycle was restored to normal in two animals but unfortunately these were not inseminated or given only a single insemination. The two other animals had recurrences.