title: Effects of small diameter IUDs on fertility and lengths of estrous cycles in ewes.
mesh_terms: D000818:Animals; D004971:Estrus; D005260:Female; D005298:Fertility; D007434:Intrauterine Devices / Q000662:veterinary*; D011247:Pregnancy; D012756:Sheep / Q000502:physiology*; D013997:Time Factors