EFFECTS OF THIAMINE INHIBITORS ON CELLULOSE DIGESTION AND VOLATILE FATTY ACID PRODUCTION IN ARTIFICIAL RUMEN FERMENTATIONS

1965 ◽  
Vol 45 (2) ◽  
pp. 99-104 ◽  
Author(s):  
L. P. Milligan ◽  
J. M. Asplund ◽  
A. R. Robblee
Keyword(s):  
Fatty Acid ◽  
Acid Production ◽  
Volatile Fatty Acid ◽  
Fermentation Medium ◽  
Rumen Fermentation ◽  
Fatty Acid Production ◽  
Rumen Microorganisms ◽  
Cellulose Digestion ◽  
Structural Analogues

The effect of the inclusion of thiamine inhibitors in a rumen fermentation medium on cellulose digestion and volatile fatty acid production by rumen microorganisms in vitro was studied. The addition of the structural analogues oxythiamine and neopyrithiamine to the fermentation medium at concentrations up to 4000 μM and 2000 μM, respectively, did not influence cellulose digestion or volatile fatty acid production. The addition of thiopental and hexetidine to the fermentation medium affected both cellulose digestion and volatile fatty acid production. Some inhibition of cellulose digestion and of volatile fatty acid production occurred with concentrations of thiopental and hexetidine in the fermentation medium as low as 720 μM and 15 μM respectively.

The use of the in vitro fermentation technique to estimate the digestible energy content of some Egyptian forages: III. The effect of periodical renewal of medium on volatile fatty acid production and cellulose digestion in vitro as criteria of energy content

1969 ◽  
Vol 73 (3) ◽  
pp. 431-436
Author(s):  
K. El-Shazly ◽  
M. A. Naga ◽  
M. A. Abaza ◽  
A. R. Abou Akkada
Keyword(s):  
Fatty Acid ◽  
Acid Production ◽  
Volatile Fatty Acid ◽  
Dry Matter ◽  
Energy Content ◽  
Correlation Coefficients ◽  
Fatty Acid Production ◽  
Cellulose Digestion ◽  
Digestible Energy

SUMMARYEleven forages of known digestible energy/kg dry matter (Naga & el-Shazly, 1963) were used in in vitro fermentation experiments. Direct determinations of digestible energy (D.E./kg D.M.) using the bomb calorimeter were also included, and the values were corrected for gas losses.In vitro fermentations were interrupted every 12, 8 and 6 h, the medium was renewed and volatile fatty acid (VFA) production and cellulose digestion were estimated. Volatile fatty acid production from legumes was high early in the fermentation periods and became lower in later periods. Non-legumes behaved in an opposite manner.Significant negative correlation coefficients between VFA production and D.E./kg D.M. were found for legumes at later intervals of fermentation, while correlation coefficients for non-legumes lost their significance at later periods of fermentation.Digestible energy/kg dry matter could best be predicted for legumes from the volatile fatty acids produced in the second 12 h fermentation period or from the sum of the VFA produced in second, third and fourth 6 h periods of fermentation.

IN VITRO STUDIES ON THE ROLE OF BIOTIN IN THE METABOLISM OF RUMEN MICROORGANISMS

1967 ◽  
Vol 47 (1) ◽  
pp. 57-64 ◽  
Author(s):  
L. P. Milligan ◽  
J. M. Asplund ◽  
A. R. Robblee
Keyword(s):  
Fatty Acid ◽  
Acid Production ◽  
Volatile Fatty Acid ◽  
Specific Effect ◽  
Biotin Deficiency ◽  
Fatty Acid Production ◽  
Rumen Microorganisms ◽  
Cellulose Digestion ◽  
Metabolic Intermediates

Four experiments, designed to study the role of biotin in cellulose digestion and volatile fatty acid production by rumen microorganisms, were conducted. These included trials to measure the effects of deletion of biotin from the fermentation medium, the addition of biotin antimetabolites to the medium, and the inclusion of metabolic intermediates on cellulose digestion and volatile fatty acid production.Omission of biotin from the medium markedly decreased cellulose digestion and volatile fatty acid production. Production of propionate was decreased approximately twice as much as was the production of acetate.Inclusion of the antimetabolite, desthiobiotin, at concentrations up to 0.47 mM had no effect, but 12 units of avidin per tube resulted in decreased cellulose digestion and reduced volatile fatty acid production. The latter effects were similar to those observed when biotin was omitted from the medium. The inhibitive effect of avidin was partially reversed by adding extra biotin. This suggests that the specific effect of a biotin deficiency on volatile fatty acid production probably involves a metabolic pathway concerned with propionate production.The addition of metabolic intermediates (glucose, 3-phosphoglycerate, pyruvate, lactate, oxaloacetate, malate, fumarate, and succinate) to biotin-containing and biotin-deficient systems failed to demonstrate that a deficiency of biotin resulted in blockage of a pathway of intermediary metabolism at any specific point.

Effects of Primary, Secondary and Tertiary Amines on in Vitro Cellulose Digestion and Volatile Fatty Acid Production by Ruminal Microorganisms

1981 ◽  
Vol 53 (1) ◽  
pp. 226-230 ◽  
Author(s):  
K. A. Baldwin ◽  
Joel Bitman ◽  
M. J. Thompson ◽  
W. E. Robbins
Keyword(s):  
Fatty Acid ◽  
Acid Production ◽  
Volatile Fatty Acid ◽  
Tertiary Amines ◽  
Fatty Acid Production ◽  
Cellulose Digestion ◽  
Ruminal Microorganisms

Effect of Physical form of Ration upon Digestion and Volatile Fatty Acid Production in Vivo and in Vitro

1963 ◽  
Vol 22 (3) ◽  
pp. 586-591 ◽  
Author(s):  
P. L. Wright ◽  
A. L. Pope ◽  
P. H. Phillips
Keyword(s):  
Fatty Acid ◽  
Acid Production ◽  
Volatile Fatty Acid ◽  
Fatty Acid Production ◽  
Physical Form

In Vitro Volatile Fatty Acid Production from Various Feeds by Bovine Rumen Microorganisms1

1958 ◽  
Vol 17 (3) ◽  
pp. 737-742 ◽  
Author(s):  
W. E. Stewart ◽  
L. H. Schultz
Keyword(s):  
Fatty Acid ◽  
Acid Production ◽  
Volatile Fatty Acid ◽  
Fatty Acid Production ◽  
Bovine Rumen

Influence of Hemicellulose A and B on Cellulose Digestion, Volatile Fatty Acid Production and Forage Nutritive Evaluation

1965 ◽  
Vol 85 (1) ◽  
pp. 89-101 ◽  
Author(s):  
L. V. Packett ◽  
M. L. Plumlee ◽  
Robert Barnes ◽  
G. O. Mott
Keyword(s):  
Fatty Acid ◽  
Acid Production ◽  
Volatile Fatty Acid ◽  
Fatty Acid Production ◽  
Cellulose Digestion

scholarly journals Physiological Responses and In-Vitro Volatile Fatty Acid Production in Cattle

2017 ◽  
Vol 6 (2) ◽  
pp. 86-94 ◽  
Author(s):  
Sunil Kumar ◽  
S.V. Singh ◽  
Simson Soren
Keyword(s):  
Fatty Acid ◽  
Acid Production ◽  
Volatile Fatty Acid ◽  
Physiological Responses ◽  
Fatty Acid Production
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