Volatile fatty acid metabolism by rumen mucosa from cattle fed hay or grain

Effects of an all-grain versus an all-hay diet on metabolic activity of rumen mucosa of cattle were investigated. After diets had been fed for 3 to 4 mo, rumen papillae were collected at slaughter from the dorsal rumen sac and incubated with one of various volatile fatty acids. Rates of substrate ut...

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Bibliographic Details
Published in:Journal of dairy science 1975-09, Vol.58 (9), p.1294-1300
Main Authors: Weigand, E, Young, J. W, McGilliard, A. D
Format: Article
Language:English
Subjects:
Acetoacetates - metabolism
Animal Feed
Animal Nutritional Physiological Phenomena
Animals
Cattle
Edible Grain
Fatty Acids, Volatile - metabolism
Gastric Juice
Gastric Mucosa - metabolism
Hydroxybutyrates - metabolism
Lactates - metabolism
Male
Rumen - anatomy & histology
Rumen - metabolism
Structure-Activity Relationship
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Summary:Effects of an all-grain versus an all-hay diet on metabolic activity of rumen mucosa of cattle were investigated. After diets had been fed for 3 to 4 mo, rumen papillae were collected at slaughter from the dorsal rumen sac and incubated with one of various volatile fatty acids. Rates of substrate utilization were in the order: n-butyrate greater than n-valerate approximately propionate greater than iso-butyrate approximately iso-valerate. Over-all, papillae from hay-fed steers utilized greater amounts of volatile fatty acids. Dietary treatment did not significantly affect extent of conversion of volatile fatty acids to lactate and to ketone bodies. Lactate was the major metabolite from propionate and n-valerate. Ketone body formation accounted for more than 90% of n-butyrate uptake by papillae. Ketone formation from n-valerate was restricted to beta-hydroxybutyrate while that from iso-valerate was essentially acetoacetate plus acetone. Metabolic systems in rumen mucosa of physiologically mature ruminants seem to adapt little to varying individual volatile fatty acids available for absorption in vivo.
ISSN:0022-0302
1525-3198
DOI:10.3168/jds.s0022-0302(75)84709-6