01056naa a2200169 a 450000100080000000500110000800800410001910000210006024501300008126000090021152005180022065000310073865000150076965000100078470000180079477300740081221419812024-02-01       1979    bl uuuu     u00u1 u    #d1 aLE JAMBRE, L. F.  aEffectiveness of morantel tartrate and naphthalophos against levamisole resistant Ostertagia in sheep.h[electronic resource]  c1979  aAbstract: 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.  aAnimal parasites and pests  aOstertagia  aSheep1 aJARTIN, P. J.  tVeterinary Science Communicationsgv. 3, n. 2, p. 153-158, Aug. 1979.