Examination of bulls for libido and breeding ability.
D000818:Animals; D001947:Breeding; D002417:Cattle / Q000235:genetics / Q000502:physiology*; D002418:Cattle Diseases / Q000503:physiopathology; D000013:Congenital Abnormalities / Q000503:physiopathology / Q000662:veterinary; D005298:Fertility; D007989:Libido / Q000502:physiology*; D008297:Male; D012726:Sexual Behavior, Animal / Q000502:physiology