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Effectiveness of a post-milking teat dip in preventing new udder infections.

Abstract A 13-month study was conducted in two herds with a combined average of 125 milking cows to determine the effectiveness of a post-milking teat dip in reducing the incidence of new infections. Teats on the right side were dipped in a commercial iodine teat dip preparation (10,000ppm) immediately after each milking and teats on the left side were controls. There were 36 new infections during lactation on the dipped side and 77 on the control side, a 53.2% reduction. The teat dip was effective in preventing new infections with streptococci and Staphylococcus aureus but did not appear to prevent new infections with gram-negative rods. The teat dip also reduced the number of clinical treatments 24%. However, it was not effective in preventing new infections during the dry period. The percentage of infected quarters on the dipped side was reduced from an initial 32 to 23% at the end of the trial whereas the incidence in the control quarters increased from 27 to 30% at the end. The progress in reducing the incidence of infected quarters was slow because of the high initial incidence of infection.