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The Effect of Bleeding versus Previous Infection on the Resistance of Lambs to Subsequent Infections of Haemonchus Contortus¹

University of Wisconsin^,6

Abstract

An experiment was conducted to investigate the effect of bleeding on the development of resistance to stomach worm infection in sheep. Under the conditions of this experiment a previous infection with Haemonchus contortus and bleeding permitted the development of similar degrees of resistance to a subsequent infection with the same parasite. This suggests that one of the most important factors in the development of a resistance in lambs to challenge infections with Haemonchus contortus is the hemorrhage produced by the blood sucking habits of the worms.

¹ Published with the approval of the Director of the Wisconsin Agricultural Experiment Station, Madison. This work supported in part by the Research Committee of the Graduate School with funds from the Wisconsin Alumni Research Foundation.

² Present address: School of Veterinary Medicine, University of Minnesota, St. Paul 1, Minn.

³ Present address: Station Biochemistry, South Dakota State College, Brookings, South Dakota.

⁴ Present address: Eli Lilly and Co., Indianapolis, Ind.

⁵ The authors wish to acknowledge the contribution in this study of Dr. C. A. Herrick, now deceased.

⁶ Animal Husbandry, Biochemistry, Zoology and Veterinary Science.