[Respiratory syndrom in swine herds in Spain and approaches to its solution]

adaptation aetiology animal health animal husbandry cerdas control de enfermedades destete disease control enfermedades respiratorias espagne etiologia etiologie exportaciones exportation exports immunity immunoglobuline immunoglobulins inmunidad inmunoglobulina lait leche lymphatic system maladie respiratoire meat production milk mortalidad mortalite mortality peso piglets poids porcelet production de viande respiratory diseases sanidad animal sevrage sistema linfatico sows spain temperatura temperature terapia therapy truie weaning weight