Age and weight at puberty and conception in different breeds and breed-crosses of beef heifers.
D000367:Age Factors; D000818:Animals; D001835:Body Weight; D001947:Breeding; D002417:Cattle / Q000254:growth & development*; D004971:Estrus; D005260:Female; D005306:Fertilization; D007315:Insemination, Artificial / Q000662:veterinary; D011247:Pregnancy; D013997:Time Factors