avs 402 2-21-08 - We emphasize that going through...

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2-21-08 We emphasize that going through glycolysis and the difference of starch being alpha connected and enzymattically brokendown in a non rum vs. a hindgut or foregut fermentor bacteria that will breakdown…that have these enzymes cellulose and hemicellulase that actually come in a similar pathway glucose-6-phos, produce pyruvic acid. Proprionic acid comes off pyruvic acid converted to acetic acid. When pyruvic acid goes to acetic acid in that fermenting microbial, gas given off…which is energy waste. The gases are methane and carbon dioxide.So instead of pyruvic acid being hydrolyzed to acetyl coA it will go to acetic acid. In ruminant animals gas production can be a significant loss. Energy chart from 101: gross energy, intake energy, digestable energy-energy lost is fecal energy. As you metabolize digestible energy you get metabolizable energy-loss of urinary and gas energy. Net energy there’s a heat of digestion, loss energy. IN ruminant animals or animals that are microbially breaking things down(hindgut), gass energy is much larger. Animal has a maintenance req. for energy. But if you just eat, sleep and don’t do anything, no production, we call that maintenance. When that animal goes into production (milk, meat, poultry, eggs, wool, work) we all know we increase energy demands. And that energy cost is due to that production. 1100lb horse does nothing and has 16.7 Mcal/day. If that horse becomes a race horsehis energy production goes up 100%. Which is 33.4 Mcal of Digestible energy/day. Increase of 16.7 Mcal/day. True or false? A horse fed for maintance that has been trained and conditioned to be a race horse and his energy req went from 16.7->33.7. therefore did energy cost for production 16.7 Mcal? It’s a maintance cost, not a production cost!
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