title: Pre-mating barriers in hybrid Haemonchus.
mesh_terms: D000818:Animals; D003433:Crosses, Genetic; D005260:Female; D006188:Haemonchiasis / Q000469:parasitology / Q000662:veterinary*; D006189:Haemonchus / Q000502:physiology*; D006824:Hybridization, Genetic; D008297:Male; D012756:Sheep / Q000469:parasitology; D012757:Sheep Diseases / Q000469:parasitology*; D013045:Species Specificity; D014251:Trichostrongyloidea / Q000502:physiology*; D014252:Trichostrongyloidiasis / Q000662:veterinary*