Abstract
Worm egg counts have shown that after the end of June infestations of pathogenic significance occur in a considerable percentage of Scottish hill lambs. On the West Coast, however, heavy infestations do not occur until August, when the egg counts in other areas are rising again after falling for a few weeks in July.Identification of larvae from faeces cultures confirm that Ostertagia spp. are the first cause of high worm egg counts, followed in August by Trichostrongylus spp., then by H. contortus and C. ovina, and finally by B. trigonocephalum. Nematodirus spp. may be sufficiently numerous in a few districts to be of pathogenic importance in June and July.
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