Glycerol supplementation in dairy cows and calves

摘要: The production of biodiesel from rapeseed oil methyl ester leaves glycerol (synonym: glycerine, 1,2,3-propanetriol) as a valuable by-product and promising feed supplement for farm animals. This thesis provides information about the supplemental feeding with to dairy cows in early lactation young calves, describes fate entering rumen impact on enteric methane gastrointestinal microbial populations. was achieved by investigating effects two products different purity - crude (88.1%) (>99%) milk production, intake metabolic parameters 42 lactation. Furthermore, routes disappearance were quantified. These i) fermentation rumen, ii) absorption across epithelium iii) outflow through omasal orifice. effect volatile fatty acid profiles population fluid investigated gas vitro system. Finally, oral rehydration solutions (ORS) added intestinal microbiota examined calves. Glycerol supplementation, irrespective purity, did not significantly affect yield or composition, total dry matter It estimated that approximately 70% absorbed mainly but probably also small intestine. A smaller fraction disappeared compartment digestion. findings indicate is an available gluconeogenic substrate which might efficiently contribute glucose synthesis liver. Addition system indicated no reduction production. bacterial archaeal community structures subjected additional followed similar pattern control additive. Glycerol shown be suitable component ORS calves since it ameliorated dehydration deprived In rapidly absorbed, presumably intestine, thus most likely microbiota.