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N = number of animals, QG = quality grade, EBF = empty body fat, Score = Taste panel score (1 to 8), %UAtbl = % unacceptable
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NRC (2000) computes ME to NEg efficiency (kg) based on the work of Garrett (1980), who used data of 2,766 animals from 72 comparative slaughter studies to regress RE on ME intake above maintenance to estimate kg(as the slope of the regression)
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Typical indexes are:
kg of calf weaned/kg of forage consumed
kg of calf weaned/kg or number females
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Overall trend is the higher the PKM, the more efficient is the animal because of the dilution of maintenance cost and faster growth of the calf
Emphasize that comparison is made at same PKM, when in reality small-size cows might have lower PKM than larger-size cows
2 124.32 114.52 56.50909 52.05455
4 51.31 50.96 23.32273 23.16364
6 41.01 41.48 18.64091 18.85455
8 34.21 34.63 15.55 15.74091
10 29.58 29.82 13.44545 13.55455
12 27.35 27.6 12.43182 12.54545
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