[Effectiveness of utilization of different genotypes of cows in relation to breeding system and body weight during the first fertilization]

animal health animal laitier animales lecheros body measurements breeds calves composition globale crecimiento croissance f1 hybrids fertilidad fertilite fertility grazing systems growth heifers hybride f1 indoor feeding lactation mensuration corporelle milk yield milk yielding animals novilla parto parturition peso poids proximate composition race razas rendement laitier rendimiento lechero sanidad animal sistemas de pastoreo ternero veau weight