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Journal of Dairy Science Vol. 78 No. 11 2502-2506
© 1995 by American Dairy Science Association ®
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Efficacy of a Barrier Teat Dip Containing .55% Chlorhexidine for Prevention of Bovine Mastitis

J. S. Hogan 1, K. L. Smith 1, D. A. Todhunter 1, and P. S. Schoenberger 1

1 Department of Dairy Science, The Ohio State University, Ohio Agricultural Research and Development Center, Wooster 44691

A natural exposure trial was conducted for 12 mo in a commercial herd of 125 lactating cows to compare the efficacy of an experimental barrier teat dip containing .55% chlorhexidine gluconate with the efficacy of a 1% iodophor for preventing new IMI and clinical mastitis. Teats of half of the cows were dipped in the experimental barrier product, and teats of the remaining half of the herd were dipped in the 1% iodophor product. Quarters dipped with the experimental barrier product had fewer new IMI caused by Escherichia coli, coagulase-negative staphylococci, or Gram-positive bacilli than did quarters dipped in the 1% iodophor. Incidence of new MI caused by Serratia spp. and Pseudomonas spp. was greater for quarters dipped in the experimental barrier product than for quarters dipped in the 1% iodophor. Efficacy of the two teat dips against new IMI caused by Staphylococcus aureus, environmental streptococci, and Klebsiella spp. did not differ. Incidence of bacteriologically negative clinical cases of mastitis was greater in quarters dipped in the 1% iodophor than in quarters dipped in the experimental barrier product. Incidence of clinical mastitis cases caused by Staph. aureus, environmental streptococci, E. coli, Klebsiella spp., Serratia spp., and Pseudomonas spp. did not differ between treatment groups.

Key Words: barrier • mastitis • teat dip

Submitted on February 21, 1995
Accepted on May 30, 1995




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