Journal article

The availability of Trichostrongylid larvae to grazing sheep after seasonal contamination of pastures

N Anderson

Crop and Pasture Science | Published : 1983


Separate paddocks of improved pasture were contaminated at different rimes with worm eggs from grazing sheep with naturally acquired infections of the genera Ostertagia, Trichostrongylus and Nernatodirus. Worm counts from 'tracer' sheep on each paddock were used to estimate the availability of larvae for up to 9 months after contamination. Typical hot and dry weather prevailed during the summer months of 1970-71, and few Ostertagia and Trichostrongylus larvae were available on any paddocks. However, larvae of these species survived in faeces over summer and their availability increased to reach peak levels on all paddocks by 8 weeks after the onset of autumn rains. Infection persisted at mod..

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