TABLE 20-5Model Abbreviations for Total and Productive Use of Energy (Mcal/D), Protein (kg or G/D (_G)), and Fat (kg or G/D (_G))

NutrientTotalProductionGrowthGestationMilk
WeightAn_BWBody_GainGrUter_WtMlk_Prod
Uter_Wt
Fet_Wt
GrUter_BWgain
Digest. energy
Metab. energyAn_MEprod_AvailGest_MeuseMlk_MEout
Net energyAn_NEgainAn_NEprod_AvailGest_NEuseMlk_NEout
Mlk_NE_Milk
ProteinBody_NPgainGest_NP_gMlk_NP_g
MlkNP_Milk
FatBody_FatBody_FatgainMlk_Fat_g
MlkFat_Milk
Amino acidsg/d
ArginineAn_ArgUse_gBody_ArgGain_gGest_Arg_gMlk_Arg_g
HistidineAn_HisUse_gBody_HisGain_gGest_His_gMlk_His_g
IsoleucineAn_IleUse_gBody_IleGain_gGest_Ile_gMlk_Ile_g
LeucineAn_LeuUse_gBody_LeuGain_gGest_Leu_gMlk_Leu_g
LysineAn_LysUse_gBody_LysGain_gGest_Lys_gMlk_Lys_g
MethionineAn_MetUse_gBody_MetGain_gGest_Met_gMlk_Met_g
PhenylalanineAn_PheUse_gBody_PheGain_gGest_Phe_gMlk_Phe_g
ThreonineAn_ThrUse_gBody_ThrGain_gGest_Thr_gMlk_Thr_g
TryptophanAn_TrpUse_gBody_TrpGain_gGest_Trp_gMlk_Trp_g
ValineAn_ValUse_gBody_ValGain_gGest_Val_gMlk_Val_g
Other factors
TimeAn_AgeDayAn_GestDayAn_LactDay

a Nutrient concentrations and intake from individual feeds are denoted using the prefix Fd_ in place of Dt_. An additional set of concentrations and intakes is calculated for the summation of Dt_Xxx + Inf_Xxx labeled as An_Xxx.

From: 20, Model Description and Evaluation

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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