THE HELMINTH PARASITES AND PARASITIC DISEASES OF SHEEP IN CANADA: I. A SURVEY AND SOME PRELIMINARY STUDIES ON EXISTING PROBLEMS

Abstract

Investigations have been made upon the identity, incidence, economic importance, and seasonal fluctuations of the helminth parasites in the alimentary canal of sheep in Canada, special consideration having been given to the problems in Quebec and eastern Ontario. Haemonchiasis is the parasitic disease of major importance in Eastern Canada during the summer months, and is replaced by trichostrongylosis, oesophagostomiasis, and possibly hookworm disease in the late autumn and winter. Haemonchiasis and chabertiasis were recorded in British Columbia.