energy problems - ANSC 321 Energy Metabolism Problem Set...

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ANSC 321 Energy Metabolism Problem Set Use information from lectures and data given below to determine the partitioning of nutrient energy and answer the questions which follow. Animal: A lactating but nonpregnant cow. Feed: 34 lb of grain (90% DM) and 28 lb of alfalfa hay (85% DM) per day. Heats of combustion (gross energy contents) for both feeds are 4.2 kcal/g of DM. Feces: 7.0 kg of fecal DM/d with an energy content of 4.5 kcal/g of fecal DM. Urine: 30 L/d with 21 g of urinary N/L and 5.25 kcal/g of urinary N. Methane: 350 L/d with a heat of combustion of 9.5 kcal/L. Milk: 34 kg/d of 4% fat-corrected milk. There are 748 kcal/kg of 4% fat-corrected milk. Respiration: O 2 consumption was 8,300 L/d and CO 2 production was 9,200 L/d. Body weight: From the carbon-nitrogen balance data, it was calculated that the cow gained 200 g of body weight/d. Assume the body fat gained was tripalmitin. Maintenance:
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This homework help was uploaded on 04/18/2008 for the course ANSC 321 taught by Professor Juanloor during the Fall '07 term at University of Illinois at Urbana–Champaign.

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energy problems - ANSC 321 Energy Metabolism Problem Set...

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