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Efficacy of .18% Iodine Teat Dip against Staphylococcus aureus and Streptococcus agalactiae¹

Hill Farm Research Station, Louisiana Agricultural Experiment Station, Louisiana State University Agricultural Center, Homer 71040

ABSTRACT

Effective postmilking teat dip products with lower iodine concentrations are being formulated as concern increases about iodine residues in milk. Increased free iodine concentration with greater germicidal activity in teat dip products is also possible with special formulation procedures. Low iodine concentration dips are cheaper and have reduced teat irritation. A concentrated iodine teat dip containing .18% iodine and 8 ppm free iodine upon dilution was evaluated under experimental bacterial challenge to determine efficacy for prevention of new intramammary infections. The undiluted product also contained 15% collagen protein emollient as a teat skin conditioner. Efficacy of the teat dip was 93.6 and 51. 7% for Staphylococcus aureus (Newbould 305) and Streptococcus agalactiae (McDonald 44). No adverse effects of the dip on teat skin were noted.

¹ Approved for publication by the director of the Louisiana Agricultural Experiment Station as Manuscript Number 87-80-1437.