[Free range husbandry of laying hens: Impossible without a cleverly devised]

abnormal behaviour animal health austria autriche bronchite bronchitis bronquitis calidad coccidiose coccidiosis comportamiento anormal comportement anormal crianza extensiva crianza libre eggs extensive husbandry feathers free range husbandry gallina ponedora gestion higiene huevos hygiene layer chickens laying performance management micoplasmosis mycoplasmose mycoplasmoses oeuf performance de ponte plumas plume poule pondeuse quality salmonellose salmonellosis salmonelosis sanidad animal