M4.6: Nutrient Losses: ANSC 100 Summer 2018 (WC).pdf

4 enzyme produc on losses once absorbed there are

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4. Enzyme Produc " on Losses Once absorbed there are still inefficiencies of use within the animal’s body. When proteins are formed in the body, to make muscle for instance, the absorbed dietary amino acids and proteins that are used for this must be converted into the correct molecular structure. When this is done there are some parts of the absorbed amino acid ‘building blocks’ that are not utilized. This unused material is excreted from the body. A common avenue of this excretion is through urine in the form of urea or as uric acid in poultry, which is formed when unused amino acids are converted to urea in the liver and excreted by the kidneys in urine. In swine this represents about a 10% N loss. An analogy can be drawn between this protein utilization efficiency and the construction of a wall in a house. When a wall is built it is common to cut framing lumber to fit the wall dimensions and create some waste. For example if the wall is nine feet long and lumber comes in 8 foot or 10 foot lengths the builder
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6/17/18, 1(53 PM M4.6: Nutrient Losses: ANSC 100 Summer 2018 (WC) Page 4 of 4 will choose to use a 10 foot board and cut 1 foot off. This would be a 10% loss of board material. A second source of this loss comes in the form of proteins that were used by the body, perhaps as muscle tissue, and then broken apart again. In this scenario the protein was actually utilized for some time. These nutrients have been utilized by the animal but still represent a percentage of feed nutrient that is excreted.
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  • Spring '17
  • Robert mikesell
  • Test Prep, Phytate, Phytase

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