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The Possibility of Establishing within Breeds Lines of Sheep that are Genetically Resistant to Stomach Worms^*

University of California

Abstract

Numerous investigators have reported that genetic selection for host resistance is efficacious. Recently Gowen² briefly summarized the results of some of these investigations. Gowen states: "Examples of host resistance are known for the whole range of pathogenic agents, bacteria, fungi, protozoa, helminths, viruses, and chemical poisons. Insofar as I am aware, no investigator who has adeqvately sought inherited host differences in disease response has failed to find them."

The recent work of Stewart, Miller, and Douglas⁴ on the incidence of infestation of different breeds of sheep to the stomach worm, Ostertagia circumcincta, apparently opens up a field of genetics that may have considerable significance and may be far reaching from the standpoint of sheep production and husbandry. I am indebted to Dr. Stewart, Professor Miller and Mr. Douglas for generously placing their data at my disposal in order that the genetic possibilities of their studies may be developed into a program that may lead to the establishment of lines of sheep genetically resistant to stomach worms within the different breeds.

^* Presented at a meeting of the Western Section of the American Society of Animal Production at Corvallis, Oregon, June 25, 1937.