scholarly journals Studies on the volatile fatty acids of sheep blood with special reference to formic acid

1954 ◽  
Vol 58 (4) ◽  
pp. 670-680 ◽  
Author(s):  
E. F. Annison
Keyword(s):  
Fatty Acids ◽  
Formic Acid ◽  
Special Reference ◽  
Volatile Fatty Acids ◽  
Sheep Blood

scholarly journals THE PRODUCTION OF VOLATILE FATTY ACIDS BY BACTERIA OF THE DYSENTERY GROUP

1921 ◽  
Vol 3 (3) ◽  
pp. 325-330 ◽  
Author(s):  
Harper F. Zoller ◽  
W. Mansfield Clark
Keyword(s):  
Fatty Acids ◽  
Formic Acid ◽  
Atmospheric Pressure ◽  
Close Agreement ◽  
Intestinal Tract ◽  
Volatile Fatty Acids ◽  
Free Access ◽  
Glucose Medium ◽  
Enormous Quantity ◽  
Human Intestinal Tract

These studies show: 1. A close agreement exists among all the organisms studied in the total quantity of volatile fatty acids produced and in the ratio of formic to acetic, under aerobic conditions, and in the presence of 1 per cent of glucose. 2. When grown upon peptone alone, with free access of air to the cultures, volatile fatty acids are produced in appreciable quantities, although the reaction of the solution has gone more alkaline as shown by colorimetric pH tests. Formic acid is not found, but in its place we obtain propionic acid. 3. Upon exhaustion of air from the non-sugar medium the bacteria again produce formic acid, and in addition some butyric. This is true for both Shiga and non-Shiga cultures. The reaction is distinctly more acid. 4. The presence of glucose in the medium from which the air has been pumped furnishes a condition which provokes about the same type and degree of fermentation that operates in the glucose medium bathed in air at atmospheric pressure. 5. The enormous quantity of formic acid produced by these bacteria may play a significant part in the digestive disturbances and toxic symptoms accompanying their infection of the human intestinal tract.

Feeding value of wilted silages made using formic acid, formaldehyde and propionic acid

1977 ◽  
Vol 25 (1) ◽  
pp. 71-81 ◽  
Author(s):  
Elizabeth Donaldson ◽  
R. A. Edwards
Keyword(s):  
Fatty Acids ◽  
Organic Matter ◽  
Formic Acid ◽  
Propionic Acid ◽  
Dry Matter ◽  
Volatile Fatty Acids ◽  
Nutritive Value ◽  
Live Weight ◽  
Ammonia Concentration ◽  
Feeding Value

SUMMARYThe nutritive value of four silages was compared using eight rumenfistulated wethers. Wilted ryegrass was ensiled without additive (A); with formic acid (13·9 kg/t dry matter) (B); with formic acid (10·3 kg/t dry matter) plus formalin (formaldehyde at 4·8 kg/t dry matter) (C); with formic acid (4·9 kg/t dry matter) plus formalin (formaldehyde at 2·3 kg/t dry matter) plus propionic acid (5·6 kg/t dry matter) (D).Dry-matter intakes were 13·8, 15·1, 14·3 and 14·3 g/kg live weight for A, B, C and D respectively. Digestibilities of organic matter and dry matter were not affected by the additives. Digestibility of nitrogen and peak ruminal ammonia concentration were significantly (P<0·05) reduced by the addition of formaldehyde.The effect on rumen fermentation characteristics, of chemically restricting in-silo fermentation, is illustrated. Differences in the rumen volatile fatty acids and in the efficiency of utilization of the energy for growth, fattening and lactation are discussed.

Sign in / Sign up

Export Citation Format

Share Document