Barley as feedstuff for laying hens

additif aux aliments des animaux alimentation des animaux animal feeding barley cebada cellulase celulasa color colour couleur eggs feed additives gain de poids gallina ponedora ganancia de peso glucosidasa glucosidase glucosidases huevos layer chickens laying performance oeuf orge peeling pelado pelage performance de ponte peso poids poule pondeuse rendimiento en la postura weight weight gain