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

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.

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.

In vitro and in vivo rumen protection of proteins coated with calcium soaps of long-chain fatty acids

1989 ◽  
Vol 112 (1) ◽  
pp. 79-83 ◽  
Author(s):  
D. Sklan
Keyword(s):  
Fatty Acids ◽  
Fatty Acid ◽  
Volatile Fatty Acid ◽  
Soya Bean ◽  
Fatty Acid Production ◽  
Bean Meal ◽  
Soya Bean Meal ◽  
In Sacco

SummaryThe in sacco, in vitro and in vivo effects of feeding proteins partially coated with calcium soaps of longchain fatty acids were examined.In sacco, 84–90% of whey powder and soya-bean meal coated with calcium salts of fatty acids remained after 20 h incubation in the rumen of sheep. In vitro tests revealed no effects on volatile fatty acid or ammonia production.In vivo sheep balance studies, where soya-bean meal coated with calcium soaps was substituted for soya-bean meal, showed no effects on ammonia or volatile fatty acid production in the rumen due to the calcium soap coated proteins. No changes were observed in digestibilities of dry matter, nitrogen or acid detergent fibre; total fatty acid digestion increased. Nitrogen balance was improved slightly in sheep fed the protected protein.It appears that proteins coated with calcium soaps are not degraded in the rumen and thus energy and non-degradable protein can be supplied to ruminants by this route.

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