A comparison between the use of a vasectomised ram and hormone impregnated intravaginal sponges.
D000818:Animals; D004971:Estrus / Q000187:drug effects; D005260:Female; D006728:Hormones / Q000494:pharmacology*; D008297:Male; D011247:Pregnancy; D011270:Pregnancy, Animal; D012098:Reproduction; D012756:Sheep / Q000502:physiology*; D013245:Sterilization, Reproductive / Q000662:veterinary*; D014649:Vas Deferens / Q000601:surgery*
D006728:Hormones