Transmission dynamics of helminth parasites of pigs on continuous pasture: Oesophagostomum dentatum and Hyostrongylus rubidus

cerdo control de enfermedades disease control disease transmission environmental factors facteur du milieu factores ambientales faeces feces grazing heces helminthe helminths helmintos hiver hyostrongylus rubidus infecciones por nematodos invierno larvae larvas larve nematoda nematode infections oesophagostomum dentatum ova ovule pastoreo pastoreo rotacional porcin rotational grazing soil sol suelo summer swine temperatura temperature transmission des maladies vegetation verano winter