[Occurrence of streptococci resistant to antibiotics in the rumen of calves].


The occurrence and antibiotic-resistance spectrum of some strains of rumen streptococci were investigated in calves of four age categories in the milk diet period at 1-3, 4-7, 8-14 days of age and 6-8 weeks of age. More than 75% of the strains isolated from the calves of all age categories were resistant to more than one tested antibiotic (tetracycline… (More)


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