title: Protective effects of premunition and age-group interaction of Haemonchus contortus in sheep.
mesh_terms: D000367:Age Factors; D000818:Animals; D001835:Body Weight; D005243:Feces; D005260:Female; D006454:Hemoglobins / Q000032:analysis; D007109:Immunity; D007814:Larva / Q000472:pathogenicity; D008297:Male; D010270:Parasite Egg Count; D012756:Sheep; D012757:Sheep Diseases / Q000209:etiology / Q000276:immunology* / Q000517:prevention & control; D013997:Time Factors; D014251:Trichostrongyloidea / Q000472:pathogenicity; D014252:Trichostrongyloidiasis / Q000209:etiology / Q000517:prevention & control / Q000662:veterinary*
chemical_list: D006454:Hemoglobins