TABLE 20-4Model Abbreviations for Maintenance Use of Energy and Protein

NutrientMaintenanceFecesUrineScurfActivityEnvironment
Digest. energyUr_DEout
Metab. energyAn_MEmUse
Net energyAn_NEmUseAn_NEm_ActAn_NEm_Env
Net proteinFe_NPend_gUr_NPend_gScrf_NP_g
NitrogenFe_N_gUr_Nout_g
PhosphorusFe_P_gUr_P_g
Factor
TempEnv_TempCurr
DistanceEnv_DistParlor
TopographyEnv_Topo
Amino acids
ArginineFe_ArgMet_gUr_ArgEnd_gScrf_Arg_g
HistidineFe_HisMet_gUr_HisEnd_gScrf_His_g
IsoleucineFe_IleMet_gUr_IleEnd_gScrf_Ile_g
LeucineFe_LeuMet_gUr_LeuEnd_gScrf_Leu_g
LysineFe_LysMet_gUr_LysEnd_gScrf_Lys_g
MethionineFe_MetMet_gUr_MetEnd_gScrf_Met_g
PhenylalanineFe_PheMet_gUr_PheEnd_gScrf_Phe_g
ThreonineFe_ThrMet_gUr_ThrEnd_gScrf_Thr_g
TryptophanFe_TrpMet_gUr_TrpEnd_gScrf_Trp_g
ValineFe_ValMet_gUr_ValEnd_gScrf_Val_g

aNutrient 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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