TABLE 6-2AA Composition of the CP and TP Fractions Involved in the Estimation of AA Supply and Recommendations

AAg AAcorr /100 g CPg AAcorr /100 g TPag AAcalc /100 g TPb
Duodenal EndogenousMicrobialcScurfWhole Empty BodyMetabolic FecalMilk
Ala4.697.389.178.596.323.59
Arg4.615.479.608.205.903.74
Asx4.7513.398.399.617.568.14
Cys2.582.092.701.743.310.93
Glx11.3114.9814.6915.7615.6722.55
Gly5.116.2621.0814.468.452.04
His2.902.211.753.043.542.92
Ile4.096.992.963.695.396.18
Leu7.679.236.938.279.1910.56
Lys6.239.445.647.907.618.82
Met1.262.631.402.371.733.03
Phe3.986.303.614.415.285.26
Pro4.644.2712.359.808.4310.33
Ser5.245.406.455.737.726.71
Thr5.186.234.014.847.364.62
Trp1.291.370.731.051.791.65
Tyr3.625.942.623.084.655.83
Val5.296.884.665.157.016.90
a

g AAcorr: AA composition corrected to account for the incomplete recovery of AA with 24-hour hydrolyses, expressed in hydrated form, and therefore sum to more than 100 for a given protein. Table modified from Lapierre et al. (2020).

b

g AAcalc: AA composition calculated from the primary structure of the reference protein of each family, expressed in hydrated form, and therefore sum to more than 100.

c

Adapted from Sok et al. (2017) using the correction factors proposed by Lapierre et al. (2019).

From: 6, Protein

Cover of Nutrient Requirements of Dairy Cattle
Nutrient Requirements of Dairy Cattle: Eighth Revised Edition.
National Academies of Sciences, Engineering, and Medicine; Division on Earth and Life Studies; Board on Agriculture and Natural Resources; Committee on Nutrient Requirements of Dairy Cattle.
Washington (DC): National Academies Press (US); 2021 Aug 30.
Copyright 2021 by the National Academy of Sciences. All rights reserved.

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