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Abstract
Two germicides containing 0.5 and 1% titratable iodine were tested for efficacy against the development of new intramammary infections (IMI) caused by Staphylococcus aureusor Streptococcus agalactiae. The two trials for postmilking teat dip used a model for experimental challenge that was recommended by the National Mastitis Council. The 0.5% iodine formulation reduced new Staph. aureus IMI by 78.2% and reduced new Strep. agalactiae IMI by 73.2%. The 1% iodine product reduced new Staph. aureus IMI by 43.5% and reduced new Strep. agalactiae IMI by 46.4%. No adverse effects on the condition of teat skin or on teat ends were observed over the course of the trials. At the completion of each trial, the teat skin of dipped quarters was characterized as normal, smooth skin that was free from scales, cracks, or chapping; the teat orifice was characterized as smooth without evidence of irritation.
Key words
Abbreviation key:
TSA (trypticase soy agar), TSB (trypticase soy broth)References
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Article info
Publication history
Accepted:
February 25,
1997
Received:
June 27,
1996
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Copyright
© 1997 American Dairy Science Association. Published by Elsevier Inc.
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