EFFICACY OF 2 BARRIER TEAT DIPS CONTAINING CHLOROUS ACID GERMICIDES AGAINST EXPERIMENTAL CHALLENGE WITH STAPHYLOCOCCUS-AUREUS AND STREPTOCOCCUS-AGALACTIAE

Two postmilking teat dips were tested for efficacy against Staphylococ cus aureus and Streptococcus agalactiae using experimental challenge p rocedures recommended by the National Mastitis Council. Both dips cont ained chlorous acid as the primary germicidal agent and lactic acid or mandelic acid as the chlorous acid activator. The dip activated with mandelic acid significantly reduced new IMI by Staph. aureus and Strep . agalactiae. The IMI rate was reduced 68.7% for Staph. aureus and 56. 4% for Strep. agalactiae. The dip activated with lactic acid significa ntly reduced new Staph. aureus IMI by 69.3% but did not significantly reduce new Strep. agalactiae IMI (35.2% reduction) through the full 11 -wk study period. Teat skin condition did not change from pretrial sta tus after using either teat dip during the study.