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The Effect of Phlebotomy versus Stomach Worm, Haemonchus Contortus, Infection on the Growth and Certain Blood Constituents of Lambs¹

University of Wisconsin³

Abstract

An experiment was conducted to study the host-parasite relationship in lambs infected with the stomach worm, Haemonchus contortus, and to determine the effect of certain hemopoietic dietary factors on the resistance of lambs to stomach worm infection. The blood hemoglobin levels of lambs were depressed in all cases by the parasite infection. Other blood constituents—plasma niacin and vitamin B₆—were also adversely affected. Growth was retarded. Phlebotomy alone produced similar effects. The anemia was less severe and weight gains were better in the case of lambs which received trace minerals plus steamed bone meal. Increasing the protein, with or without minerals, appeared to be of little value in increasing the resistance of lambs to stomach worm infection.

¹ Published with the approval of the Director of the Wisconsin Agricultural Experiment Station, Madison. This work was supported in part by the Wisconsin Alumni Research Foundation.

² Present address: Animal Husbandry Dept., North Dakota Agricultural College. Fargo, N. D.

³ Departments of Animal Husbandry, Biochemistry, and Veterinary Science, Madison, Wisconsin.