[Testing of different laying hen hybrids in floor husbandry: Some origins are suited]

abnormal behaviour breeds (animals) calidad comportamiento anormal comportement anormal crianza en el suelo eggs feed conversion efficiency feed intake floor husbandry gallina ponedora genotipos genotypes huevos hybride hybrids layer chickens laying performance mortalidad mortalite mortality normas norme oeuf performance de ponte performance testing peso poids poule pondeuse prise alimentaire (animaux) pruebas de rendimiento quality race (animal) razas (animales) standards weight