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  • Title: Observations on the egg output resulting from continuous low level infections with Ostertagia circumcincta in lambs.
    Author: Jackson F, Christie MG.
    Journal: Res Vet Sci; 1979 Sep; 27(2):244-5. PubMed ID: 523815.
    Abstract:
    Faecal egg counts were determined twice weekly for two groups of four-month-old worm free cross Suffolk lambs experimentally infected with 100 and 320 Ostertagia circumcincta larvae, five times per week for 20 weeks. The group mean egg count in both groups rose to a maximum of approximately 500 eggs per gram during weeks 12 to 14 and had fallen to less than half of that value at slaughter. There was no statistical difference in egg output between these two groups or between them and a comparable group of lambs receiving 4000 Ostertagia circumcincta larvae per day. No significant changes in live weight gain or serum pepsinogen levels were observed in the lambs given 100 and 320 larvae per day.
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