Depletion of Brilliant Blue F.C.F., Penicillin G and Dihydrostreptomycin in Milk from Treated Cows with Experimentally Induced Mastitis

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Abstract
A field trial was set up to compare depletion of Brilliant Blue F.C.F., penicillin and dihydrostreptomycin following three infusions of Streptopen cerate 100 to six cows with experimentally induced staphylococcal mastitis. The presence of dye was noted by milk color at the time of milking, and by the ion exchange resin method in the laboratory. Penicillin residues were determined by a diffusion agar plate microbiological method using Sarcina lutea and by Delvotest P. Dihydrostreptomycin residues were measured by the diffusion agar plate method (Bacillus subtilis). Dye extinction times were found to be significantly longer than penicillin and dihydrostreptomycin extinction times in both the infected sides and the healthy sides. No significant differences were observed between healthy and infected sides for dye, penicillin or dihydrostreptomycin extinction.

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