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In vitro and in vivo Rumen Microbiological Studies with 2-Chloro-4,6-Bis(Isopropylamino)-S-Triazine (Propazine)

U. S. Department of Agriculture

Abstract

Side-chain and ring-labeled ¹⁴C-Propazine preparations were incubated in vitro with the following: (1) 11 characterized ruminal bacterial cultures, (2) mixed bacterial suspensions and (3) ciliated protozoal species and ruminal digesta from animals on high concentrate rations in the presence or absence of daily feeding of Propazine. The data suggest that Propazine and possibly Atrazine and Simazine were not degraded by rumen microbial sources under rigid anaerobic conditions.

In in vivo studies with sheep fed Propazine up to 80 mg./kg. bodyweight, Propazine did not stimulate or inhibit rumen bacterial- and ciliated-protozoal populations.

¹ Metabolism and Radiation Research Laboratory, Animal Husbandry Research Division, ARS, Fargo, North Dakota 58102.

² The authors gratefully acknowledge the receipt of ¹⁴C-labeled and non-labeled triazines from the Geigy Chemical Corporation, Ardsley, N. Y.; and ¹⁴C-side-chain-labeled Propazine from Drs. J. D. Robbins, J. E. Bakke and Mr. V. J. Feil of this laboratory. We thank Mrs. Mary Clare Helgeson for her competent technical assistance, and Dr. Robert S. Fulghum of North Dakota State University for supplying the characterized bacterial strains.