Effectiveness of morantel tartrate and naphthalophos against levamisole resistantOstertagia in sheep |
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| Authors: | L F Le Jambre P J Martin |
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| Institution: | (1) Division of Animal Health, Pastoral Research Laboratory, CSIRO, Private Mail Bag, P.O., 2350 Armidale, N.S.W., (Australia) |
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| Abstract: | Adult worms from a levamisole resistant population ofOstertagia consisting ofO. circumcincta andO. trifurcata showed no dose response to morantel tartrate. The lowest dose rate of 2.2 mg/kg removed 30.8% of worms while the highest dose rate of 17.6 mg/kg removed 39.2%. A dose response was obtained against naphthalophos and the LD50 and LD95 were determined as 12.54 mg/kg and 23.25 mg/kg respectively. It was concluded that the strain was cross resistant to morantel tartrate but not to naphthalophos. |
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