title: Determination of teat dip germicidal activity using the excised teat model.
abstract: Fifteen postmilking teat antiseptics were evaluated in seven trials using the excised teat model. All products were tested against Staphylococcus aureus Newbould 305 and Streptococcus agalactiae Cornell 48. Eight of nine iodophor products provided log reductions greater than 3 against Staph. aureus and Strep. agalactiae. A .045% iodophor product was ineffective. A .5% chlorhexidine product yielded a log reduction of 3.22 against Staph. aureus but only 2.92 against Strep. agalactiae. Two products containing fermented milk emulsified in detergent were tested upon receipt and after 1 yr storage. Fresh product provided log reductions greater than 3 against both pathogens. Storage for 1 yr resulted in minimal loss of germicidal activity. Three products containing 1, .5, and .2% dodecylaminoalkyl glycine provided log reductions greater than 3.5 against Staph. aureus and greater than 4 log reduction against Strep. agalactiae.
authors.affiliation: Mastitis Research Laboratory, Louisiana State University Agricultural Center, Homer 71040.
authors.forename: J L
authors.initials: JL
authors.lastname: Watts
authors.forename: R L
authors.initials: RL
authors.lastname: Boddie
authors.forename: W E
authors.initials: WE
authors.lastname: Owens
authors.forename: S C
authors.initials: SC
authors.lastname: Nickerson
mesh_terms: D000818:Animals; D000900:Anti-Bacterial Agents / Q000494:pharmacology*; D002417:Cattle; D004341:Drug Evaluation / Q000379:methods / Q000662:veterinary; D005260:Female; D066298:In Vitro Techniques; D008321:Mammary Glands, Animal / Q000187:drug effects / Q000382:microbiology*; D008414:Mastitis, Bovine / Q000382:microbiology / Q000517:prevention & control*; D013211:Staphylococcus aureus / Q000187:drug effects*; D013292:Streptococcus agalactiae / Q000187:drug effects*
chemical_list: D000900:Anti-Bacterial Agents