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Background  The practise of teat disinfection prior to cluster attachment for milking is being adopted by farmers in Ireland, particularly where there are herd issues with new infection rates. Pre-milking teat disinfection has been shown to reduce bacterial numbers on teat skin and to be most effective against environmental bacteria such as  Escherichia coli  and  Streptococcus uberis.  A split udder design experiment was undertaken on two research herds (A = 96 cows: B = 168 cows) to test the benefit of pre-milking teat disinfection on new mastitis infection levels. The disinfectant was applied to the left front and right hind teats of all cows in each herd and the right front and left hind teats received no disinfectant treatment prior to milking over a complete lactation. Individual quarter foremilk samples were taken on 5 occasions during the lactation and all clinical cases were recorded. The presence and number of staphylococcus and streptococcus bacteria on teat skin of a random sample of experimental cows ( n  = 20) was measured on 3 occasions during lactation (April, June, and October).    Results  Pre-milking teat disinfection had no significant impact on quarter SCC and new infection rates ( P  > 0.05). The median SCC was 169 (95% CI = 144–198) × 10 3  cells/mL and 170 (95% CI = 145–199) × 10 3  cells/mL for disinfected teats and non-disinfected teats, respectively. There were no differences in SCC observed between herds (A = 161 (95% CI = 127–205) × 10 3  cells/mL; B = 169 (95% CI = 144–198) × 10 3  cells/mL) over the complete lactation. Bacterial levels on teat skin were reduced significantly with pre-milking teat disinfection compared to teats receiving no disinfectant ( P  < 0.001). Total infections (clinical and sub-clinical) were similar for disinfected teats ( n  = 36) and not disinfected teats ( n  = 40), respectively.  Staphylococcus aureus  ( n  = 47) and  Strep. uberis  ( n  = 9) were identified as the predominant bacteria in quarter foremilk samples with both clinical and sub-clinical infections.    Conclusion  SCC and new infection rates were similar in non-disinfected teats and disinfected (pre-milking) teats. The routine application of pre-milking teat disinfectant in pasture-grazed herds is unlikely to be of benefit where herd SCC is below 200 × 10 3  cells/mL.

Effect of pre-milking teat disinfection on new mastitis infection rates of dairy cows