The cow that returns to estrus regularly.
D000818:Animals; D002417:Cattle; D002418:Cattle Diseases / Q000175:diagnosis*; D004971:Estrus; D005260:Female; D005831:Genital Diseases, Female / Q000150:complications / Q000662:veterinary*; D007247:Infertility, Female / Q000209:etiology / Q000662:veterinary*; D011247:Pregnancy