[Interactions between genotype and nutrition in relation to bone strength of laying hens]

animal breeding battery husbandry bone diseases bone formation bones calcio calcium crianza en el suelo disease resistance floor husbandry formation des os fracturas fracture fractures gallina ponedora genotipos genotypes huesos layer chickens mejoramiento animal mouvement movement movimiento os osteopathie physical activity poule pondeuse resistencia a la enfermedad selection suplementos supplements