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Journal of Dairy Science Vol. 75 No. 11 3185-3190
© 1992 by American Dairy Science Association ®
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Evaluation of a Nisin-Based Germicidal Formulation on Teat Skin of Live Cows

P. M. Sears 1, B. S. Smith 1, W. K. Stewart 1, R. N. Gonzalez 1, S. D. Rubino 2, S. A. Gusik 2, E. S. Kulisek 2, S. J. Projan 3, and P. Blackburn 3

1 Cornell University, Ithaca, NY 14850
2 Applied Microbiology, Inc., New York, NY 10016
3 Applied Microbiology, Inc. and Public Health Research Institute, New York, NY 10016

A purified preparation of the nontoxic antimicrobial peptide, nisin (AMBICIN N®), was used in the formulation of a germicidal sanitizer suitable for use on cow teats. The germicidal activity of the formulation against mastitis pathogens was measured on teat skin of live cows. The nisin-based formulation gave a mean log reduction of 3.90 against Staphylococcus aureus and 4.22 log reduction againstEscherichia coli after exposure for 1 min to the germicide. This activity was comparable with that exhibited by a 1% iodophor teat dip but was significantly greater than that exhibited by the .1 and .5% iodophors and by the .5% chlorhexidine digluconate teat dips. The nisin-based formulation showed little or no potential for skin irritation after multiple application to skin, but iodophor and chlorhexidine digluconate teat dips showed significant potential for skin irritation in comparable studies.

Key Words: premilking • germicide • antimicrobial peptide • nisin

Submitted on November 4, 1991
Accepted on June 25, 1992




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