3Wollenberger L,Halling-Sorensen B,Kusk K O. Acute and chronic toxicity of veterinary antibiotics to daphnia magna[J]. Chemophere,2000,40(7):723-730.
4Strong L,Wall R,Woolford A,et al. The effect of faecally excreted ivermectin and fenbendazole on the insect colonization of cattle dung following the oral administration of sustained release boluses[J].Vet Parasitol,1996,62(3-4):253-266.
