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Board-invited review: Recent advances in biohydrogenation of unsaturated fatty acids within the rumen microbial ecosystem.
This review summarizes recent advances in 4 major areas of bioHydrogenation: the microorganisms involved, identification of intermediates, the biochemistry of key enzymes, and the development and testing of mathematical models to predict biohydrogenation outcomes. Expand
Lipid metabolism in the rumen.
  • T. Jenkins
  • Biology, Medicine
  • Journal of dairy science
  • 1 December 1993
The mechanism of how lipids interfere with ruminal fermentation is a complex model involving partitioning of lipid into the microbial cell membrane, potency of the lipid to disrupt membrane and cellular function, physical attachment of microbial cells to plant surfaces, and expression and activity of microbial hydrolytic enzymes. Expand
Fat in lactation rations: review.
Current research and practice demonstrate that 3 to 5% fat may be added to diets for lactation to increase energy intake of high-producing cows and/or to reduce starch feeding, thereby increasing the ratio of forage to concentrate to prevent depression of milk fat. Expand
Comparison of fatty acid content of milk from Jersey and Holstein cows consuming pasture or a total mixed ration.
There are potentially important differences in fatty acid composition of milk from cows consuming a warm season pasture species compared with milk from animals consuming a total mixed ration, as well as differences between Holstein and Jersey breeds. Expand
Microbial biohydrogenation of oleic acid to trans isomers in vitro.
It is concluded that the biohydrogenation of oleic acid by mixed ruminal microbes involves the formation of several positional isomers of trans monoenes rather than only direct bioHydrogenation to form stearic acid as previously described. Expand
Major advances in nutrition: impact on milk composition.
The major advances in controlling milk composition by dietary manipulation and how it influences the entire animal system from practical feeding studies to basic cellular work on mammary tissue metabolism are highlighted. Expand
The effects of feeding fish oil on uterine secretion of PGF2alpha, milk composition, and metabolic status of periparturient Holstein cows.
Dietary fatty acids given during the periparturient period can reduce the uterine secretion of PGF2alpha in lactating dairy cows and alter the fatty acid profile of milk fat. Expand
Effects of amount and source of fat on the rates of lipolysis and biohydrogenation of fatty acids in ruminal contents.
Findings suggest that high linoleic acid concentrations in the diet would possibly reduce biohydrogenation and increase the postruminal flow of this unsaturated fatty acid. Expand
Effect of fatty acids or calcium soaps on rumen and total nutrient digestibility of dairy rations.
Two trials ascertained whether feeding fatty acids as preformed calcium soaps would permit normal digestibility of fiber without reducing availabilities of fatty acids or energy and found that tallow fatty acids markedly reduced Digestibility of dry matter and fiber in the rumen. Expand
Nutrient digestion, biohydrogenation, and fatty acid profiles in blood plasma and milk fat from lactating Holstein cows fed canola oil or canolamide
Abstract The effects of feeding protected or unprotected canola oil on intake, nutrient digestibility, duodenal fatty acid flows, milk yield, and milk composition were evaluated using four HolsteinExpand