References and links


  • Risk factors for drench resistance in sheep. January 2008 - Issue 4, Wormwise
  • The production costs of anthelmintic resistance in sheep managed within a monthly preventive drench program; I.A. Sutherland, J. Shaw, R.J. Shaw. 2010. Veterinary Parasitology.
  • Prevalence of anthelmintic resistance on sheep farms in New Zealand. Waghorn, al: N ZVJ 54: 271-277, 2006.