Influence of Tylosin and Aureomycin upon Rumen Metabolism and the Microbial Population2

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Abstract
Supplementation of a control ration with tylosin (15 mg/day) or aureomycin (30 mg/day) provided 3 treatments in a double 3x3 Latin-square experiment. Six wethers were used. Rumen protozoal concentrations were increased following antibiotic supplementation, while no differences were observed in the total viable bacteria concentrations. Marked differences were observed when viable bacteria determinations were made on media containing rumen fluid from each treatment, particularly with the media containing rumen fluid from animals which received tylosin. Volatile fatty acid distributions were modified by the treatments. Butyric acid concentrations were greater for the tylosin than for the control treatment before feeding, but not after feeding; the converse was true for propionic acid.