Ruminant-derived foods contain high proportions of saturated fats as a result of ruminal biohydrogenation that rapidly saturates and thus limits the availability of free unsaturated fatty acids for assimilation. The objective of this study was to evaluate the effects of glycerol on ruminal free-fatty acid (FFA) production rates and in vitro fermentation kinetics of alfalfa hay. In vitro incubat...

A sustainable increase in livestock production would require selection for improved feed efficiency, but the mechanisms underlying this trait and explaining its large individual variation dairy ruminants remain unclear. This study was conducted lactating ewes to test hypothesis that rumen biohydrogenation (BH) differ between high- low-efficiency animals, these differences be reflected fatty aci...

conjugated linoleic acids (cla) are natural constituents of meat and dairy products from ruminants, originating from bacterial biohydrogenation in the rumen. cla supplementation increases the health benefits of animal-derived foods. there are inconsistent reports of the effects of dietary cla on chicken’s performance; however, the majority of previous reports cite anti-lipogenic effects of cla....

1. alpha-[U-(14)C]Linolenic acid was incubated with the rumen contents of sheep and the metabolic products were characterized by thin-layer chromatography, gas-liquid chromatography and absorption spectroscopy in the ultraviolet and infrared. 2. A tentative scheme for the biohydrogenation route to stearic acid is presented. The main pathway is through diconjugated cis-cis-cis-octadecatrienoic a...

Recent studies of dietary habits in children and adolescents performed in Spain show that a high percentage of the daily energy intake corresponds to fat (42.0-43.0%). These findings show an excessive contribution of saturated fatty acids and also a considerable supply of trans fatty acids. These compounds are formed generally during partial hydrogenation of vegetable oils, a process that conve...

Advances in our understanding of lipid metabolism in the ruminant and the effect of specific fatty acids on both ruminant metabolism and human health has increased significantly in recent years. Unique biohydrogenation intermediates formed in the rumen have been shown to be potent inhibitors of milk fat synthesis, and the biology behind this and its potential application and benefit to both ani...

Conjugated linoleic acid is a group of positional and geometrical isomers of linoleic acid (C18:2, cis-9, cis-12), an essential fatty acid for human and animals. It is produced in ruminants via biohydrogenation of poly-unsaturated fatty acids and during the mechanical processing of dairy products. Meat and dairy products from ruminant animals (such as milk, butter, yogurt and cheese) are the pr...

Phytochemical plant tannins are phenolic compounds that interfere with biohydrogenation (BH) of monounsaturated-(MUFA) and poly-unsaturated fatty acids (PUFA). The objective of the present animal study was to investigate the effects of three different levels of phytochemical tannin-containing ground pine bark diet on fatty acid profiles of goat meat, with particular reference to MUFA and PUFA. ...