Abstract
A comparison is made of the infectivity and pathogenicity in Scottish Blackface and Dorset lambs of a strain of Trichostrongylus axei larvae passaged in Scottish Blackjace sheep. Dorset lambs at 2 months of age have a high resistance to infection compared to 2-month-old Scottish Blackface lambs in that fewer parasites become established, fewer lambs die and they lose less weight following infection. Four-month-old Scottish Blackface lambs had the greatest resistance in that fewer lambs died, they showed superior weight gains but did not have fewer parasites establishing from infections. It is concluded that with the larval strain used Dorset lambs have a greater resistance to infection and the effects of infection, and that older lambs have a greater resistance to the effects of infection.
Published Version
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