title: [Testosterone levels of the plasma of bulls in relation to growth, breed, semen quality and sexual activity].
abstract: Using Anderson's method for estimation of testosterone level by competitive protein binding, the authors determined plasma testosterone level in young bulls of three breeds: black and white, and red and white lowland. It was found that in bulls of black and white and red and white lowland breed the testosterone level showed great fluctuations without growing tendency. In charolais bulls, in pubescence, testosterone level was low and did not exceed 1 ng/1 ml, but it systematically increased beginning from the 14th month of life. No correlation of testosterone level with protein and energy intake or with sexual activity was observed in adult bulls (breeders) of black and white lowland breed during 12 months of examination.
mesh_terms: D000818:Animals; D001947:Breeding; D002417:Cattle / Q000502:physiology*; D006128:Growth; D008297:Male; D012661:Semen / Q000032:analysis; D012726:Sexual Behavior, Animal / Q000502:physiology; D013094:Spermatozoa / Q000502:physiology; D013739:Testosterone / Q000097:blood*
chemical_list: D013739:Testosterone
vernacular_title: Poziom testosteronu w osoczu buhajów w zalezności od wzrostu, rasy, jakości nasienia i aktywności płciowej.