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

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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. Copyright © . .