A peptide agonist of GnRH; binds to GnRHR (Ki = 0.1 nM); decreases testicular volume, semen volume, sperm motility, and total sperm count, as well as increases the percentage of abnormal sperm, in dogs via a subcutaneous implant at 3, 6, and 12 mg per animal; decreases disease severity and plasma levels of estradiol, 17-hydroxyprogesterone, and androstenedione in ferrets with ACD at 3 mg/implant per animal; suppresses ovulation and estrus in cats at 4.7 mg/implant per animal