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The Effect of Mineral and Phenothiazine Supplementation on the Resistance of Grazing Lambs to Haemonchus Contortus Infection¹

University of Wisconsin^,4

Abstract

Experiments were conducted during four successive years to determine the relative effectiveness of various combinations of trace mineralized salt, dicalcium phosphate and phenothiazine in alleviating the effects of stomach worm infection in grazing lambs. The results show that the feeding of trace mineralized salt, supplemented with either dicalcium phosphate or phenothiazine, was superior to the unsupplemented salt ration in reducing the injurious effects of stomach worm infection. Lambs fed dicalcium phosphate exerted a resistance to the effects of stomach worm infection that was approximately equal to that obtained by the use of phenothiazine. Best results were obtained, however, from the feeding of a combination of dicalcium phosphate and phenothiazine.

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

² Present address: South Dakota State College, Brookings, South Dakota.

³ The authors wish to thank Dr. R. F. Shumard for help and guidance in this study and to acknowledge the contribution of Dr. C. A. Herrick now deceased.

⁴ Departments of Animal Husbandry, Biochemistry and Zoology, Madison.