title: The relative susceptibility of Soay and Blackface sheep to natural infection with Dictyocaulus filaria.
abstract: Simultaneous studies by faecal larval counts on a mixed flock of Blackface and Soay ewes, yearlings and lambs suggested that the Soay animals were less able to develop resistance to Dictyocaulus filaria. This susceptibility resulted in a greater proportion of the Soay ewes developing heavy burdens of these lung worms, and in a greater proportion of the yearlings and ewes excreting D filaria larvae in their faeces.
mesh_terms: D000818:Animals; D001947:Breeding; D004022:Dictyocaulus Infections / Q000453:epidemiology* / Q000469:parasitology; D005243:Feces / Q000469:parasitology; D005260:Female; D012756:Sheep; D012757:Sheep Diseases / Q000453:epidemiology* / Q000469:parasitology