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  • Title: The dynamics of ovine gastrointestinal nematode infections within ewe and lamb cohorts on three Scottish sheep farms.
    Author: Hamer K, McIntyre J, Morrison AA, Jennings A, Kelly RF, Leeson S, Bartley DJ, Chaudhry U, Busin V, Sargison N.
    Journal: Prev Vet Med; 2019 Nov 01; 171():104752. PubMed ID: 31479849.
    Abstract:
    Gastrointestinal nematodes (GIN) are a serious concern for sheep producers worldwide. However, there is a paucity of evidence describing the epidemiology of GIN on modern UK sheep farms. The aim of this paper was to understand whether expected seasonal variations of infection are still found in ewes and lambs under varying management strategies in temperate climates. Faecal egg counts (FEC) were conducted on freshly voided samples collected from groups of ewes and lambs every third week for twelve months on three farms in southeast Scotland. The patterns of egg output have been described here in relation to management practices undertaken on the farms. Despite changes in farming practice and climatic conditions, the findings complement historical studies detailing the epidemiology of GIN. Findings include a periparturient rise in ewe FEC on two of the farms, while lambing time treatment appeared to suppress this on the third farm. On the same two farms lamb FEC increased during the summer, reaching a peak in the autumn. The work also highlights how the ad hoc use of anthelmintics does little to impact these patterns.
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