Effects of high iron and sulfate ion concentrations on dry matter digestion and volatile fatty acid production by ruminal microorganisms

1992 ◽  
Vol 70 (4) ◽  
pp. 1188-1194 ◽  
Author(s):  
G. A. Harrison ◽  
K. A. Dawson ◽  
R. W. Hemken
Keyword(s):  
Fatty Acid ◽  
Acid Production ◽  
Volatile Fatty Acid ◽  
Dry Matter ◽  
Sulfate Ion ◽  
Fatty Acid Production ◽  
Ion Concentrations ◽  
High Iron ◽  
Ruminal Microorganisms

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.

Corrigenda

1979 ◽  
Vol 41 (2) ◽  
pp. 407-407
Keyword(s):  
Organic Matter ◽  
Steady State ◽  
Fatty Acid ◽  
Bacterial Growth ◽  
Acid Production ◽  
Volatile Fatty Acid ◽  
Dry Matter ◽  
Fatty Acid Production ◽  
Digestible Organic Matter ◽  
The Relationship

The relationship between rumen bacterial growth intake of dry matter, digestible organic matter and volatile fatty acid production in buffalo (Bos bubalis) calves By Singh U. B. Verma D. N. Verma A. and Ranjhan S. K. Vol. 38 (1977), no. 3 Page 337A model for the estimation of volatile fatty acid production in the rumen in non-steady-state conditions By Morant S. V. Ridley J. L. and Sutton J. D. Vol. 39 (1978), no. 3 Page 452

DRY MATTER LOSS AND VOLATILE FATTY ACID PRODUCTION IN THE ARTIFICIAL RUMEN AS INDICES OF FORAGE QUALITY

1958 ◽  
Vol 38 (2) ◽  
pp. 171-180 ◽  
Author(s):  
J. M. Asplund ◽  
R. T. Berg ◽  
L. W. McElroy ◽  
W. J. Pigden
Keyword(s):  
Fatty Acid ◽  
Acid Production ◽  
Volatile Fatty Acid ◽  
Dry Matter ◽  
Nutritive Value ◽  
Rumen Fluid ◽  
Fatty Acid Production ◽  
Dry Matter Loss ◽  
Dry Matter Digestibility ◽  
Alfalfa Hay

Procedures are described for determining dry matter losses and for measuring volatile fatty acid production by direct chromatographic separation of acids produced during incubation of finely ground forages in miniature artificial rumen units. The results of preliminary assays done on three samples of unknown digestibility—excellent alfalfa hay, good mixed grass-alfalfa hay, and oat straw—showed that significantly different percentages of dry matter were lost and significantly different amounts of fatty acids were produced when feeds of such diverse quality were fermented. Analysis of the data for two groups of 11 and 6 samples of hay, for which dry matter digestibility coefficients as determined with sheep were available, indicated the existence of a high degree of correlation between dry matter digestibility in vivo and both dry matter loss and fatty acid production in vitro. Differences in assay results were observed when filtered rumen fluid or washed cells from the rumen fluid of sheep fed hay or from sheep fed straw were employed as sources of inocula. Examples of unsolved problems which are pertinent to the appraisal of the efficacy of artificial rumen assays for the estimation of the nutritive value of forages are discussed.

A Techno-Economic case for Volatile Fatty Acid Production for Increased Sustainability in the Wastewater Treatment Industry

2021 ◽  
Author(s):  
Ganesh K Veluswamy ◽  
Andy Ball ◽  
Richard Dinsdale ◽  
Alan Guwy ◽  
Kalpit Shah
Keyword(s):  
Wastewater Treatment ◽  
Fatty Acid ◽  
Anaerobic Digestion ◽  
Acid Production ◽  
Volatile Fatty Acid ◽  
Fugitive Emissions ◽  
Fatty Acid Production

Methane, the final product of methanogenesis during anaerobic digestion is a low value product (0.1$/m3). Concerns over fugitive emissions from methane coupled with recent reduction in costs of solar and...

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