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  • Title: Hygiene in the prevention of udder infections. IV. Evaluation of teat dips with excised cows' teats.
    Author: Philpot WN, Boddie RL, Pankey JW.
    Journal: J Dairy Sci; 1978 Jul; 61(7):950-5. PubMed ID: 100535.
    Abstract:
    Suspensions of Staphylococcus aureus, Streptococcus agalactiae, Escherichia coli, and Pseudomonas aeruginosa were used to contaminate teats excised from cows. Commercially available teat dips were applied for evaluation of comparative germicidal activity. Iodophors, sodium hypochlorite, and sodium dichloro-s-triazenetrione were highly effective against all four test organisms. Quarternary ammonium, chlorhexidine, and cetylpyridinium chloride were effective against Staphylococcus aureus, and Streptococcus agalactiae but not Escherichia coli and Pseudomonas aeruginosa. Bronopol and 8-hydroxyquinoline sulfate were marginally effective on the two Gram positive organisms and ineffective on the two Gram negatives. Three of the dips were ineffective against all four pathogens; two were in nonaqueous bases, and the other was a blend of pine oil and antibodies with udder origin. In other trials, iodophor at .3% titratable iodine was highly effective against Staphylococcus aureus and Streptococcus agalactiae. Products containing .5 and 1% iodophor maintained effectiveness after each was used to dip 140 teats under conditions of commercial dairying. Logarithmic reduction in the geometric mean number of organisms recovered from teats was more meaningful for evaluating data than percent reduction.
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