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The persistence of stomach worms on blue-grass pasture

University of Illinois

Abstract

The length of time that the larvae of the sheep stomach worm (Haemonchus contortus) may persist on pasture under various conditions is of great practical importance as well as of scientific interest. Its importance in practical sheep husbandry arises because of the frequency of the question, "How long must sheep be kept off a pasture to free the pasture of parasitic larvae?" The answer to that question has a very direct bearing on the method of treating breeding flocks for the control of these parasites. Obviously environmental conditions, such as temperature and moisture, amount of vegetation, etc., vary greatly from season to season, from year to year, and in different sections of the country. Any complete study of the period of time that these parasites may exist outside the host is, therefore, not a matter that can be completed in a short time. Furthermore, any solution of the question necessitates the availability of animals known to be free of the parasites and requires areas of land on which sheep can be placed with reasonable assurance that ova may not be introduced from other source.