The effect of sheep-rumen contents on unsaturated fatty acids

Abstract

pure ethyl dehydrocholate, m.p. 221-223°, and an impure but different ester, m.p. 157-166°. The infrared spectra of these two substances in the range 1200-900 cm.-' showed an overall similarity but also definite differences.

Flow and Composition of Lymph in the Young Bovine

“…Heath et al, (1964) reported evidence of significant amounts of trans isomers of fatty acids in the lymph from sheep. These trans isomers probably resulted from the hydro génation of unsaturated fatty acids by rumen microorganisms (Shorland et al, 1957). The fatty acid composition of triglycerides in thoracic duct lymph of cows (Leat and Hall, 1968;Wadsworth, 1968) is similar to that reported for intestinal lymph of sheep (Felinski et al, 1964;Heath et al, 1964).…”

Fatty Acid Components of Ovine Tissue Lipids, and The Response to Prolonged Protein Depletion

“…Other workers have found a significant decrease in rumen microorganisms when sheep were fed on a low quality diet (Moir 1951), and diminished microbial reduction of linolenic acid might be expected to cause the intermediate monoethenoid acid to become more predominant at the expense of stearic acid (Shorland et al 1959). This proposal would also explain the inversion of the C '8 (sat.)…”

Lipids in relation to rumen function

“…As is discussed in some detail by Shorland et al (1957), it is interesting to note that the positional and geometrical isomers that result from the microbial hydrogenation of unsaturated fatty acids are very similar to those which are produced during the industrial hardening of lipids by hydrogenation.…”