Lecture28 - Carbohydrate Digestion in Ruminants Metabolism...

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Carbohydrate Digestion in Ruminants Metabolism of carbohydrates (either structural or non-structural) by the rumen microbes results in the production of VFAs which in turn make up 70% to 80% or more of the ruminant’s energy supply. Carbohydrates are a major source of energy for the ruminant. Provides energy for the microbes for their metabolism, growth and protein synthesis Ruminant animal uses the end products of microbial fermentation as an energy source. Carbohydrate metabolism by ruminal microorganisms supplies 70 to 80% of the ruminants total energy requirement.
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Carbohydrate Digestion in Ruminants Plant Carbohydrates Cell Contents Cell Wall Organic acids Pectins Sugars B -glucans Starches Hemicellulose Fructans Cellulose Cell contents are rapidly and essentially completely digested (98%) Microbial digestion of the cell wall is variable based on many factors
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Because rumen microbes efficiently degrade dietary carbohydrates, glucose levels absorbed from the small intestine can be low. Because of this, the process of gluconeogenesis is very important in ruminants and the supply of glucose precursors and rate of glucose synthesis may be limiting factors in animal productivity and health. Gluconeogenesis is the biosynthesis of new glucose, from non-sugar carbon substrates like pyruvate, lactate and glycerol and not from glycogen. The production of glucose from other metabolites is necessary for use as a fuel
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This note was uploaded on 09/19/2011 for the course ANS 5446 taught by Professor Brown during the Spring '08 term at University of Florida.

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Lecture28 - Carbohydrate Digestion in Ruminants Metabolism...

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