Seasonal breeding: nature's contraceptive.
D000818:Animals; D001947:Breeding; D002369:Castration; D002940:Circadian Rhythm; D003670:Deer / Q000502:physiology; D004971:Estrus; D005260:Female; D005640:Follicle Stimulating Hormone / Q000378:metabolism; D006062:Gonadotropins / Q000378:metabolism; D007031:Hypothalamus / Q000378:metabolism; D008027:Light; D007986:Luteinizing Hormone / Q000378:metabolism; D008297:Male; D008550:Melatonin / Q000378:metabolism; D010870:Pineal Gland / Q000378:metabolism; D010906:Pituitary Hormone-Releasing Hormones / Q000378:metabolism; D011247:Pregnancy; D011388:Prolactin / Q000097:blood / Q000378:metabolism; D012621:Seasons; D012756:Sheep / Q000502:physiology; D013737:Testis / Q000378:metabolism; D013739:Testosterone / Q000097:blood
D006062:Gonadotropins; D010906:Pituitary Hormone-Releasing Hormones; D013739:Testosterone; D011388:Prolactin; D007986:Luteinizing Hormone; D005640:Follicle Stimulating Hormone; D008550:Melatonin