Abstract
SUMMARY In Experiment 1 three groups of worm-free lambs were given 5 000 Trichostrongylus colubriformis larvae daily for 23 days. Two groups were medicated in the food for 28 days with either 1.0 or 1.25 mg/kg/day morantel tartrate. The third group remained unmedicated as control. Post-mortem worm counts showed a reduction of 73% ( P In Experiment 2 three groups of worm-free calves were given 1000 Ostertagia ostertagi and 50 Dictyocaulus viviparus larvae daily for 63 days. Two groups were medicated in the food for the whole period with either 1.0 or 1.5 mg/kg/day morantel tartrate. The third group remained unmedicated as control. Faecal egg counts showed a significant reduction in cumulative Ostertagia egg excretion of 67% ( P P Dictyocaulus larval excretion of 50 and 80% compared with controls for the 1.0 and 1.5 mg/kg/day dose levels respectively.
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