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Screening Tests for New Teat Dips ¹

Department of Veterinary Clinical Sciences, College of Veterinary Medicine, St. Paul, MN 55108
H. B. Fuller Company, Monarch Chemicals Division, Minneapolis, MN 55421

ABSTRACT

Increased use of after-milking teat dips has resulted in the appearance of many new teat dips and a need for methods of evaluation of efficacy. A method was developed for determining the ability of a disinfectant to kill bacteria on the teat ends. Results from several known efficacious products indicated an approximate 95% reduction in bacterial flora. Additional data are presented on some experimental products. This method will provide a measure of effectiveness of a product on teat-skin disinfection. The effect of some changes in the testing procedure on bacterial reduction is demonstrated: 1) Increased times between inoculation and dipping and between dipping and swabbing tended to decrease recoveries on control teats. 2) Saline dips on control teats provided increased recoveries of test organisms.

¹ Submitted as Journal Paper No. 8979 from the Minnesota Agriculture Experiment Station and published with the approval of the director.