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Application of postmilking teat sanitizer by spraying was evaluated in two experimental challenge trials with Streptococcus agalactiae (ATCC 27956) (McDonald 44). A .5% quaternary ammonium teat sanitizer was used in both studies. By direct comparison, teat spraying and dipping did not differ in effectiveness. Efficacy for the .5% quaternary ammonium compound was 58.6%, similar to results on the product applied as a dip (13).
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Pankey et al. (1983) studied this question.
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