The susceptibility of Ostertagia and Cooperia to morantel tartrate after extended exposure to the morantel sustained release bolus

agentes nocivos alimentation alimentation des animaux animal animal domestique animal feeding animal nuisible animal pour cuirs et peaux animales animales de carne animales nocivos animals anthelminthique anthelmintics artiodactyla artiodactyle aschelminthes bovidae bovide bovin bovine bovines cattle domestic animals drugs facteur de production facteur nuisible feeding feeding systems ganado ganado bovino grazing lands helminthe helminths helmintos injurious factors invertebrados invertebrates land livestock mammals meat animals medicamentos nematode nematodes nematodos noxious animals nutrition organisme nuisible ostertagia pastizales pastures pests plagas production factors rumiante ruminant ruminants technique d'alimentation terre tierras tierras de pastoreo unrestricted feeding vertebrados vertebrates vertebre zootechnie zootechny zootecnia