[Comparison of different breeds of dwarf hens, bred in open housing and in cages, second study]

animal femelle animales hembra battery husbandry broiler chickens consommation alimentaire (animaux) consumo de piensos crianza en el suelo crossbreds feed consumption female animals fertilidad fertilite fertility floor husbandry oviposition pollo de engorde poulet de chair production costs productos del cruzamiento produit de croisement