Development of puberty in Nigerian and White Leghorn cockerels.
D000367:Age Factors; D000818:Animals; D001835:Body Weight; D002645:Chickens / Q000502:physiology*; D003129:Comb and Wattles / Q000033:anatomy & histology / Q000254:growth & development; D005260:Female; D005298:Fertility; D008297:Male; D009549:Nigeria; D009929:Organ Size; D013737:Testis / Q000033:anatomy & histology / Q000254:growth & development