References
- Donald , A.D. 1984 . “ Anthelmintic resistance in parasites of sheep ” . In Sheep production and preventative medicine , 493 – 507 . Post. Grad. Found. Vet. Sci., Sydney Univ. . In, Proc. No. 67
- Donald , A.D. , Waller , P.J. , Dobson , R.J. and Axelsen , A. 1980 . The effect of selection with levamisole on benzimidazole resistance in Ostertagia spp. of sheep . Int. J. parasitol. , 10 : 381 – 389 .
- Hughes , P.L. and Seifert , D.A. 1983 . Field comment on anthelmintic resistance of sheep nematodes . N.Z. vet. J. , 31 : 183 – 184 .
- Kettle , P.R. , Vlassoff , A. , Reid , T.C. and Horton , C.T. 1983 . A survey of nematode control measures used by milking goat farmers and of anthelmintic resistance on their farms . N.Z. vet J. , 31 : 139 – 143 .
- Robertson , T.G. and Elliott , D.C. 1966 . The laboratory assessment of worm parasite populations in sheep . N.Z. J. agric. Res. , 9 : 350 – 358 .
- Waller , P.J. , Dobson , R.J. and Donald , A.D. 1983 . Further studies on the effect of selection with levamisole on a benzimidazole resistant population of Ostertagia spp. of sheep . Int. J. Parasitol. , 13 : 463 – 468 .