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26 Cards in this Set
- Front
- Back
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energy
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potential do to work
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energy units
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Mjoules, Kjoules, Mcal, Kcal
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1 calorie=
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amount of energy as heat required to raise temp of 1g of water from 16.5-17.5C |
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energy partitioning
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GE -feces = DE - (urine+gas) = ME (-heat increment) = NE
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gross energy
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not an indicator of energy available to animal
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heat of combustion
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energy released when an organic substance is oxidized to CO2 and H2O
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digestible energy
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decreases with increased feed intake (faster rate of passage)
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DE does not account for
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energy losses of digestion + metabolism
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TDN
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total digestible nutrients, is outdated
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ME
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80% in ruminants, 94-98% in sm animal and swine
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ME affected by
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type of digestion, end use of AAs, feed intake
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NE
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energy available to animal for useful purposes
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heat increment of feeding
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energy costs of digestive and metabolic processes
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diets have different NEm and NEg because
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energy used more efficiently for maintenance than gain
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energy requirements influenced by
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BW, growth, gestation, lactation, exercise, enviro
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ME for CHO
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3.5 kcal/g
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ME for protein
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3.5 kcal/g
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ME for fat
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8.5 kcal/g
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digestible feed
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portion of feed which is not excreted in feces + is assumed to be absorbed
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DM digestibility=
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(consumed-excreted)/consumed
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measuring digestibility
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total collection, indicator method, in vitro, in sacco
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total collection
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in vivo, feed known quantity, collect total fecal output, analyze
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indicator method
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in vivo, feed known quantity + indicator, collect faecal samples
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in vitro
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simulated digestion in lab (rumen fluid, pepsin)
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in sacco
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ground feed samples in nylon bags, inserted into rumen, removed + analyzed
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apparent digestibility
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endogenous secretions into gut falsely decrease digestibility
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