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Post-milking iodine teat skin disinfectants: 1. Bactericidal efficacy

Published online by Cambridge University Press:  01 June 2009

Richard F. Sheldrake ,
Roderic J. T. Hoare  and
Jo-Anne E. Hutchinson
Richard F. Sheldrake
Affiliation:
New South Wales Department of Agriculture, Veterinary Research Station, Glenfield, N.S.W. 2167, Australia
Roderic J. T. Hoare
Affiliation:
New South Wales Department of Agriculture, Veterinary Research Station, Glenfield, N.S.W. 2167, Australia
Jo-Anne E. Hutchinson
Affiliation:
New South Wales Department of Agriculture, Veterinary Research Station, Glenfield, N.S.W. 2167, Australia
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Summary

An iodine teat skin disinfectant tested in lactating cows over a range of concentrations, 100 to 10 000 mg available iodine/1 (mg avI/l) was found bactericidally effective against Staphylococcus aureus when containing 1000 mg avI/l or greater. Against Streptococcus dysgalactiae 5000 mg avI/l or greater was bactericidally effective.

The addition of glycerine to a disinfectant containing 5000 or 1000 mg avI/l at levels of 225 ml/1 and 105 ml/1, respectively, resulted in a reduction in bactericidal efficacy of the disinfectant. Emulsified paraffin added at concentrations of between 50 and 500 ml/1 had no effect on the efficacy of the 5000 mg avI/l disinfectant, but the addition of 200 ml/1 emulsified paraffin to a 1000 mg avI/l disinfectant significantly reduced its efficiency. Iodine disinfectants containing emulsified paraffin phase separated rapidly during storage, and the bactericidal efficacy of the phases differed significantly and diminished with time.

Type
Original Articles
Information
Journal of Dairy Research , Volume 47 , Issue 1 , February 1980 , pp. 19 - 26
Copyright
Copyright © Proprietors of Journal of Dairy Research 1980

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