[Use of test bulls for detection of estrus].
D000818:Animals; D002417:Cattle; D004971:Estrus; D005260:Female; D007315:Insemination, Artificial / Q000662:veterinary*; D008297:Male; D011247:Pregnancy
Ispol'zovanie bykov-probnikov dlia vyiavleniia polovoĭ okhoty.