Abstract
The effect of chloral hydrate, an inhibitor of methanogenesis, on the participation of the acrylate pathway in the formation of propionate from lactate in rumen contents of cattle was studied in vitro. Addition of chloral hydrate resulted in only a small stimulation of the acrylate pathway, much lower than the stimulation of propionate production by chloral hydrate. This means that the flux of carbon through both the acrylate and the dicarboxylic acid pathway is increased during chloral hydrate feeding. The influence of time of sampling after feeding on the contribution of the acrylate pathway was studied in a separate experiment. A marked drop in the participation of the acrylate pathway in propionate formation from lactate during at least 2 h after feeding was observed, whereafter a rapid rise to prefeeding levels occurred.
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