Journal article

Trichostrongylid infections of sheep in a winter rainfall region: I. Epizootiological studies in the Western District of Victoria, 1966-67

N Anderson

Crop and Pasture Science | Published : 1972

Abstract

Regular post-mortem counts from 'tracer' and flock sheep, together with faecal worm egg counts and plasma pepsinogen determinations, formed the basis of an epizootiological study of trichostrongylid infections of Merino sheep in the Western District of Victoria. Species from genera Trichostrongylus, Ostertagia and Nematodirus predominated in the worm counts; Haemonchus contortus was absent. Counts of Ostertagia and Trichostrongylus spp. from successive groups of 'tracer' sheep showed a pronounced seasonal distribution of available larvae in accordance with the temperature and humidity components of the prevailing weather. Mean worm counts ranging from 2000 to 32,000 per fortnight were record..

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