[Hygiene and health in alternative husbandry systems for poultry]

animal health animal husbandry methods aves de corral avipoxvirus bacteriose bacterioses bacteriosis control de enfermedades crianza en el suelo crianza libre disease control erysipelothrix floor husbandry free range husbandry gallina ponedora higiene histomonas hygiene infecciones por protozoos infection layer chickens poule pondeuse poultry protozoal infections protozoose sanidad animal virose viroses virosis volaille