A targeted treatment works best
TARGETED selective treatment (TST) of lambs for worms was a good strategy for delaying anthelmintic resistance on farms, said Dr David Bartley of Moredun Research Institute.
He told visitors to Scotsheep 2010 about a trial where lambs were only wormed if their weight gain was lower than the grass availability suggested it should be.
This saw the average lamb drenched 2.6 times before slaughter and only reduced the efficacy of the anthelmintic by 1.1 per cent.
In comparison routinely worming lambs every three weeks meant 5.3 treatments before slaughter and a 20.7 per cent reduction in anthelmintic efficacy.
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