TABLE 20-1, General Location and Nutrient Abbreviations Used for Constructing Model Terms - Nutrient Requirements of Dairy Cattle

Location	Description	Nutrients	Description
Fd	Feed	Wt	Weight
Dt	Diet	GE	Gross energy
An	Whole animal	DE	Digestible energy
DEnp	DE minus DE from TP
Rum	Rumen	ME	Metabolizable energy
SI	Small intestine	GasE	Gaseous energy
LI	Large intestine	NE	Net energy
TT	Total digestive tract	DM	Dry matter
Fe	Feces	OM	Organic matter
Ur	Urine	NDF	Neutral detergent fiber
Body	Whole empty body	ForNDF	Forage NDF
Frm	Body frame	ADF	Acid detergent fiber
Rsrv	Body reserves	Lg	Lignin
Gest	Gestation	St	Starch
GrUter	Gravid uterus	rOM	Residual OM
Uter	Uterus plus caruncles	CP	Crude protein
Fet	Fetus	TP	True protein
Mlk	Milk and lactation	MP	Metabolizable protein
Scrf	Scurf	NP	Net protein
Env	Animal environment	CPA	CP A fraction, in situ
CPB	CP B fraction, in situ
Other abbreviations	CPC	CP C fraction, in situ
Conc	Concentrates	NPN	Supplemental nonprotein nitrogen
For	Forage	FA	Fatty acids
ForDry	Dry forage	Ash	Ash
ForWet	Wet forage	Arg	Arginine
Past	Pasture	His	Histidine
Dc	Digestibility	Ile	Isoleucine
Dig	Digested	Leu	Leucine
Lys	Lysine
Met	Methionine
Minerals and vitamins		Phe	Phenylalanine
Ca	Calcium	Thr	Threonine
P	Total phosphorus	Trp	Tryptophan
Pinorg	Inorganic P	Val	Valine
Porg	Organic P	C12	Lauric acid
Na	Sodium	C14	Myristic acid
Mg	Magnesium	C16	Palmitic acid
K	Potassium	C16.1	Palmitoleic acid
Cl	Chloride	C18.0	Stearic acid
S	Sulfur	C18.1c	Oleic acid
Co	Cobalt	C18.1t	Vaccenic + elaidic acid
Cu	Copper	C18.2	Linoleic acid
Fe	Iron	C18.3	Linolenic acid
I	Iodine	OtherFA	Other FA
Mn	Manganese	VitA	Vitamin A
Mo	Molybdenum	VitD	Vitamin D
Se	Selenium	VitE	Vitamin E
Zn	Zinc	DCAD	Cations—anions

Location

Description

Nutrients

Description

Feed

Weight

Diet

Gross energy

Whole animal

Digestible energy

DEnp

DE minus DE from TP

Rum

Rumen

Metabolizable energy

Small intestine

GasE

Gaseous energy

Large intestine

Net energy

Total digestive tract

Dry matter

Feces

Organic matter

Urine

NDF

Neutral detergent fiber

Body

Whole empty body

ForNDF

Forage NDF

Frm

Body frame

ADF

Acid detergent fiber

Rsrv

Body reserves

Lignin

Gest

Gestation

Starch

GrUter

Gravid uterus

rOM

Residual OM

Uter

Uterus plus caruncles

Crude protein

Fet

Fetus

True protein

Mlk

Milk and lactation

Metabolizable protein

Scrf

Scurf

Net protein

Env

Animal environment

CPA

CP A fraction, in situ

CPB

CP B fraction, in situ

Other abbreviations

CPC

CP C fraction, in situ

Conc

Concentrates

NPN

Supplemental nonprotein nitrogen

For

Forage

Fatty acids

ForDry

Dry forage

Ash

ForWet

Wet forage

Arg

Arginine

Past

Pasture

His

Histidine

Digestibility

Ile

Isoleucine

Dig

Digested

Leu

Leucine

Lys

Lysine

Met

Methionine

Minerals and vitamins

Phe

Phenylalanine

Calcium

Thr

Threonine

Total phosphorus

Trp

Tryptophan

Pinorg

Inorganic P

Val

Valine

Porg

Organic P

C12

Lauric acid

Sodium

C14

Myristic acid

Magnesium

C16

Palmitic acid

Potassium

C16.1

Palmitoleic acid

Chloride

C18.0

Stearic acid

Sulfur

C18.1c

Oleic acid

Cobalt

C18.1t

Vaccenic + elaidic acid

Copper

C18.2

Linoleic acid

Iron

C18.3

Linolenic acid

Iodine

OtherFA

Other FA

Manganese

VitA

Vitamin A

Molybdenum

VitD

Vitamin D

Selenium

VitE

Vitamin E

Zinc

DCAD

Cations—anions

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.

NCBI Bookshelf. A service of the National Library of Medicine, National Institutes of Health.

TABLE 20-1General Location and Nutrient Abbreviations Used for Constructing Model Terms