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Journal of Dairy Science Vol. 85 No. 1 252-257
© 2002 by American Dairy Science Association ®
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Efficacy of Two Acidified Chlorite Postmilking Teat Disinfectants with Sodium Dodecylbenzene Sulfonic Acid on Prevention of Contagious Mastitis Using an Experimental Challenge Protocol

L. Y. Oura 1, L. K. Fox 1, C. C. Warf 2, and G. K. Kemp 2

1 Department of Animal Sciences, Washington State University, Pullman 99164
2 Alcide Corporation, Redmond, WA 98052

Two acidified sodium chlorite postmilking teat disinfectants were evaluated for efficacy against Staphylococcus aureus and Streptococcus agalactiae by using National Mastitis Council experimental challenge procedures. The effect of these teat dips on teat skin and teat end condition was also determined. Both dips contained 0.32% sodium chlorite, 1.32% lactic, and 2.5% glycerin. Dips differed in the amount of sodium dodecylbenzene sulfonic acid (0.53 or 0.27%) added as a surfactant. Both dips significantly reduced new intramammary infection (IMI) rates compared with undipped controls. The dip containing 0.53% dodecylbenzene sulfonic acid reduced new IMI by Staph. aureus by 72% and Strep. agalactiae by 75%. The dip containing 0.27% dodecylbenzene sulfonic acid reduced new IMI by Staph. aureus by 100% and by Strep. agalactiae by 88%. Changes in teat skin and teat end condition for treatment and control groups varied in parallel over time. Teats treated with either teat dip had higher mean teat skin and teat end scores than control teats at some weeks. However, teat skin and teat end condition did not tend to change from the start to the completion of the trial. Application of the two new postmilking teat dips was effective in reducing new IMI from contagious mastitis pathogens.

Key Words: teat dip • contagious mastitis • chlorous acid

Submitted on June 18, 2001
Accepted on September 18, 2001




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