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The growth and acid-producing ability of proteinase-positive and proteinasenegative starter cultures were studied in the presence of several antibiotics commonly used in treating bovine mastitis. Proteinase-positive and proteinase-negative variants of two different strains of Streptococcus cremoris were inoculated separately into heat-sterilized, reconstituted nonfat milk containing a range of concentrations of either dihydrostreptomycin, erythromycin, or penicillin G. Generation times and pH changes were determined for each sample following incubation at 38C for 5 h.
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Hafez et al. (1985) studied this question.
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