The effect of gastrointestinal parasitism on grazing behaviour, herbage intake and performance in calves

behaviour bovin calves cattle comportamiento comportement control de enfermedades controlled release cooperia oncophora diagnosis diagnostic diet dieta disease control disease prevention faeces feces feed intake gain de poids ganado bovino ganancia de peso grazing heces infecciones latentes infecciones por nematodos infection latente ivermectin ivermectina ivermectine latent infections nematoda nematode infections pastoreo prise alimentaire (animaux) ternero veau weight gain