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Appl Environ Microbiol. 1967 November; 15(6): 1417-1421
Copyright © 1967 American Society for Microbiology. All Rights Reserved.

Protozoan, Bacterial, and Volatile Fatty Acid Changes Associated with Feeding Tylosin

Institute of Nutrition and Food Technology, Ohio State University, Columbus, Ohio 43210

ABSTRACT

Tylosin was fed to two of six wethers for 79 days, to a second two for only 28 days, and not at all to a third pair (controls). The addition of tylosin to the daily feed resulted in a rapid twofold increase in protozoal concentration and a change in the composition or characteristics, or both, of the bacterial population. The results indicate that the bacterial population was modified to the extent of about 80%. Total acid concentrations were initially depressed but appeared to be greater than those in control animals at the termination of the experiment. Deletion of tylosin from the ration resulted in a rapid decrease in protozoal concentrations, whereas changes in the bacterial population did not occur for a further 30 days.

¹ Present address: Jawaharlal Neheyn Agricultural University, Jabalpur, India.

² Present address: Department of Animal Husbandry, Michigan State University, East Lansing, Mich. 48823.