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Drug Residues Recovered in Feed after Various Feedlot Mixer Truck Cleanout Procedures

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A study was conducted to determine the effectiveness of two methods of equipment cleanout, sequencing or flushing, for reducing drug carryover in feedlot mixer trucks. Feed samples were collected from total mixed rations before and after various feed mixer equipment cleanout procedures. Medicated rations contained either 11 ppm of tylosin or 166 or 331 ppm of chlortetracycline. There were no differences between sequencing and flushing or between flushing with dry barley and flushing with barley silage in the median proportion of drug recovered in the next ration. A larger drug reduction was achieved using flush material at a volume of 10 versus 5% of the mixer capacity and mixing the flush material for 3 versus 4 min. Regardless of the drug or prescription concentrations in the total mixed rations or the equipment cleanout procedure used, concentrations of chlortetracycline and tylosin recovered were very low.

Document Type: Research Article

Affiliations: 1: Alberta Beef Health Solutions Inc., Box 307, Picture Butte, Alberta, Canada T0K 1V0 2: Food Directorate Western Region Laboratory, Health Products and Food, British Columbia/Alberta Region, Health Canada, 3155 Willingdon Green, Burnaby, British Columbia, Canada V5G 4P2 3: Western College of Veterinary Medicine, 52 Campus Drive, Saskatoon, Saskatchewan, Canada S7N 5B4

Publication date: January 1, 2010

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