The relationship of hatchability and proportions of yolk, albumen and shell in eggs of hens bred in a cage technology system

age blanc d'oeuf cage cages clara de huevo coquille d'oeuf eclosabilidad del huevo edad egg hatchability egg shell egg white eggs gallina ponedora huevos jaulas layer chickens laying performance oeuf performance de ponte peso poids poule pondeuse pure lines rendimiento en la postura vitellus weight yema de huevo