Jj. Vermunt et al., INEFFICACY OF MOXIDECTIN AND DORAMECTIN AGAINST IVERMECTIN-RESISTANT COOPERIA SPP OF CATTLE IN NEW-ZEALAND, New Zealand Veterinary Journal, 44(5), 1996, pp. 188-193
Two cases are described in which strains of Cooperia spp. of cattle we
re found to be resistant to either the oral or the injectable formulat
ions of ivermectin. Injectable moxidectin was not effective against th
e latter strain and doramectin was not effective against either of the
ivermectin-resistant Cooperia isolates. In both cases, the anthelmint
ic efficacy of oral levamisole was 100%.