title: Haemonchus contortus: factors determining the polymorphism of linguiform females.
mesh_terms: D000367:Age Factors; D000818:Animals; D005243:Feces; D005260:Female; D005808:Genes, Recessive; D006041:Goats; D007814:Larva / Q000502:physiology; D008297:Male; D010270:Parasite Egg Count; D011110:Polymorphism, Genetic; D012756:Sheep; D012757:Sheep Diseases; D013997:Time Factors; D014251:Trichostrongyloidea / Q000502:physiology; D014252:Trichostrongyloidiasis / Q000662:veterinary