[Semen PRRSV-free [boars; Porcine Reproductive and Respiratory Syndrome Virus; Piedmont]]

animal breeding boars breeds (animals) control de enfermedades controllo delle malattie disease control immunity immunità inmunidad lelystad virus mejoramiento animal miglioramento genetico degli animali pcr piamonte piedmont piemont piemonte prrs race (animal) razas (animales) razze (animali) sdrp semen sperma sperme srrp srrs verraco verrat verri virus de lelystad virus di lelystad