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The Helminth Parasites and Parasitic Diseases of Sheep in Canada. II. Notes on the Effect of Winter upon the Free-Living Stages of Nematode Parasites of Sheep on the Pastures in Eastern Canada



The Helminth Parasites and Parasitic Diseases of Sheep in Canada. II. Notes on the Effect of Winter upon the Free-Living Stages of Nematode Parasites of Sheep on the Pastures in Eastern Canada



Canad. J. comp. Med 4: 155-161



II. Owing to the protection afforded by snow, the low air temperatures of winter in Canada have little effect on the living organisms in the soil. They are exposed, however, to almost constant freezing temperatures for a long period. Haemonchus and Oesophagosto-mum columbianum cannot resist winter conditions and are carried over only in the hosts to reinfect the pastures each spring.

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