Influence of Addition of Yeast Culture Supplement to Diets of Lactating Cows on Ruminal Fermentation and Microbial Populations 1

G.A. Harrison; R.W. Hemken; K.A. Dawson; R.J. Harmon; K.B. Barker

doi:10.3168/jds.S0022-0302(88)79894-X

Research-article| Volume 71, ISSUE 11, P2967-2975, November 1988

Influence of Addition of Yeast Culture Supplement to Diets of Lactating Cows on Ruminal Fermentation and Microbial Populations ¹

G.A. Harrison ²
Author Footnotes
2 Present address: Dairy Science Department, South Dakota State University, Brookings 57007.
G.A. Harrison
Footnotes
2 Present address: Dairy Science Department, South Dakota State University, Brookings 57007.
Affiliations
Department of Animal Science,University of Kentucky, Lexington 40546
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R.W. Hemken
R.W. Hemken
Affiliations
Department of Animal Science,University of Kentucky, Lexington 40546
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K.A. Dawson
K.A. Dawson
Affiliations
Department of Animal Science,University of Kentucky, Lexington 40546
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R.J. Harmon
R.J. Harmon
Affiliations
Department of Animal Science,University of Kentucky, Lexington 40546
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K.B. Barker
K.B. Barker
Affiliations
Department of Statistics, University of Kentucky, Lexington 40546
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Author Footnotes
1 This manuscript (87-5-286) is published with the approval of the director of the Kentucky Agricultural Experiment Station.
2 Present address: Dairy Science Department, South Dakota State University, Brookings 57007.

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Abstract

Six ruminally fistulated Holstein cows were utilized in a randomized block design to examine effects of yeast culture supplement on ruminal metabolism and apparent digestibility. Cows were fed a diet of 40% corn silage and 60% concentrate (DM basis). Treatments were control (supplement without yeast cells) and yeast culture supplement. Treatment periods were 6 wk. Ruminal pH, ammonia, molar proportions of acetate and isovalerate, and acetate:propionate ratio were lower and molar proportions of propionate and valerate higher in cows receiving yeast. The concentration of anaerobic bacteria tended to be higher and cellulolytic bacteria concentrations were greater in cows fed yeast than in cows receiving control diet. Supplemental yeast did not affect molar proportions of isobutyrate or butyrate, total VFA, or viable yeast concentrations in ruminal fluid. Ruminal liquid dilution rate and total tract apparent digestibilities were not different between treatments. Rate of disappearance of cellulose in vitro was lower in cows receiving yeast. Less variation in ammonia concentrations and mircobial numbers suggest that ruminal fermentation was more stable in cows receiving yeast culture supplement.

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Accepted: May 23, 1988

Received: February 18, 1988

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DOI: https://doi.org/10.3168/jds.S0022-0302(88)79894-X

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