Heritability and factors affecting growth traits and age at first calving of zebu beef heifers in South-Eastern Mexico

age beef biological differences biological rhythms birth weight bovin breed differences breeds (animals) carne de res cattle crecimiento croissance crossbreds edad ganado bovino growth growth rate heifers heredabilidad heritability intervalle entre parturition intervalo entre partos mexico mexique novilla parto parturition parturition interval peso al destete peso al nacimiento poids au sevrage productos del cruzamiento produit de croisement race (animal) razas (animales) rythme biologique saison seasons taux de croissance tropical zones viande bovine weaning weight zebu zebu cattle zona tropical zone tropicale