Parasite resistance in US cattle.

摘要: Parasite resistance to the macrocyclic lactones (ivermectin, doramectin, eprinomectin, and moxidectin) is receiving considerable attention in US cattle industry at a time when economics of parasitism constitute one most important factors involved beef production. Knowing whether dewormer effective extremely an operation. If parasites become resistant particular product or formulation, serious problem can develop unknowingly unless producers have easy way determine efficacy. The fecal egg count reduction test (FECRT) simple recommended by American Association Veterinary Parasitologists (AAVP) as best for practitioner help verify that dewormer(s) they are using effective. FECRT involves conducting check treatment again 14 days following treatment. In fall 2007 continuing through summer 2008, free lab support was offered bovine practitioners throughout conduct FECRTs with their clients. This done according standard protocol involving minimum 20 samples per group each collection time. results being recorded national data base supported Intervet/Schering-Plough Animal Health University Nevada-Reno. Over 58 veterinary clinics 19 states already participated this program, over 119 separate tests 4,765 wide range products formulations. These confirm lactone widespread continued vigilance required profession, since now appears be critical stage millions dollars production losses stake.