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Journal of Dairy Science Vol. 81 No. 8 2293-2298
© 1998 by American Dairy Science Association ®
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Germicidal Activity of a Chlorous Acid-Chlorine Dioxide Teat Dip and a Sodium Chlorite Teat Dip During Experimental Challenge with Staphylococcus aureus and Streptococcus agalactiae

R. L. Boddie 1, S. C. Nickerson 1, and R. W. Adkinson 2

1 Mastitis Research Laboratory, Hill Farm Research Station, Louisiana Agricultural Experiment Station, Louisiana State University Agricultural Center, Homer 71040
2 Department of Dairy Science, Louisiana Agricultural Experiment Station, Louisiana State University Agricultural Center, Baton Rouge 70803

Three postmilking teat dips were tested for efficacy against Staphylococcus aureus and Streptococcus agalactiae in two separate studies using experimental challenge procedures that were recommended by the National Mastitis Council. The first study evaluated a barrier teat dip product containing chlorous acid-chlorine dioxide as the germicidal agent, and the second study evaluated a sodium chlorite product with a barrier component as well as a sodium chlorite product without a barrier component. The chlorous acid-chlorine dioxide teat dip reduced new intramammary infections (IMI) caused by Staph. aureus by 91.5% and reduced new IMI caused by Strep. agalactiae by 71.7%. The barrier dip containing sodium chlorite reduced new IMI caused by Staph. aureus and Strep. agalactiae by 41.0 and 0%, respectively. The nonbarrier dip containing sodium chlorite reduced new IMI caused by Staph. aureus by 65.6% and reduced new IMI caused by Strep. agalactiae by 39.1%. Teat skin and teat end conditions were evaluated before and after the second study; no deleterious effects among dipped quarters compared with control quarters were noted for the two sodium chlorite products.

Key Words: chlorine dioxide • teat dip • Staphylococcus aureus • Streptococcus agalactiae

Submitted on December 1, 1997
Accepted on April 1, 1998




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