Glossary of Terms
Note: The metric system is used internally for all calculations even if the user has chosen to use English units. No units are specified for variables used to calculate mineral requirements or supply because different units are used for different minerals.
a1: The thermo neutral maintenance requirement (Mcal/day/ kg BW ^ 0.75).
a2: Adjustment for previous temperature effect on maintenance requirement for heifers. (Mcal/day/kg SBW ^ 0.75).
Absorbable: Total quantity of absorbable mineral supplied by the diet.
ADF: Acid detergent fiber (% DM).
ADFIP: Acid detergent insoluble protein (% DM).
ADG: Average daily gain for animal given current age and weight status (kg/day)
ADG1st: Average daily gain at first calving (kg/day).
ADG1stBred: Average daily gain at first breeding (kg/day).
ADGnonBred: Average daily gain of non-pregnant replacement heifers (kg/day).
ADG2nd: Average daily gain at second calving (kg/day).
ADG3rd: Average daily gain at third calving (kg/day).
ADGPreg: Average daily gain due to conceptus growth (g/day).
ADGwPreg: Average daily gain with pregnancy (kg/day).
ADP: Apparently digestible protein (g/day).
ADPAllowGain: ADP allowable gain for young calves (g/day).
ADPGrowth: Apparently digested crude protein available for growth for young calves (g/day).
ADPMaint: Apparently digested crude protein for maintenance for young calves (g/day).
AF(1 to 9): Proportion of fat in the animal at specified condition score.
Age1st: Age at first calving (months).
Age2nd: Age at second calving (months).
Age3rd: Age at third calving (months).
AP(1 to 9): Proportion of protein in animal at specified condition score.
Arg: Arginine (% CP).
Arg_Flow: Flow of arginine to the small intestine (g/day).
ArgPctMP: Arginine as a percent of metabolizable protein (%).
Ash: Dietary ash (% DM).
Balance: Difference between the quantity of the mineral required and supplied.
Breed: Breed of animal. The choices are Ayrshire, Brown Swiss, Guernsey, Holstein and
BV: Biological value used in apparently digested protein (ADP) calculation for young calves.
BW: Body weight (kg).
Ca: Calcium (% DM).
CaBio: Bioavailability of calcium in a feed (%).
CalfADG: Average daily gain of young calves (g/day).
CalfADPBal: Digestible apparently digested protein balance for young calves (g/day).
CalfAge: Calf age (weeks).
CalfBW: Calf body weight (kg).
CalfCPBal: Digestible crude protein balance for young calves (g/day).
CalfKg: Efficiency of use of ME for NEg.
CalfKm: Efficiency of use of ME for NEm.
CBWFromMW: Used to compute calf birth weight from mature weight of cow if Calf BW is not available (kg).
CalfTemp: Environmental temperature for calves (° C).
cAsh: Calf ash (% DM).
CBW: Calf birth weight (kg).
cCa: Calf calcium (% DM).
CCFact: Coat condition factor used to adjust dry matter intake predictions for replacement heifers.
cCl: Calf chloride (% DM).
cCo: Calf cobalt (% DM).
cCP: Calf crude protein (% DM).
cCU: Calf copper (% DM).
cDCP: Calf digestible crude protein (% DM).
cDE: Calf digestible energy (Mcal/kg DM).
cDM: Dry matter for calf feeds (% as Fed (AF)).
cEE: Calf ether extract (% DM).
cFe: Calf iron (% DM).
cGE: Calf gross energy (Mcal/kg DM).
CI: Calving interval (months).
cI: Calf iodine (% DM).
cK: Calf potassium (% DM).
Cl: Chlorine (% DM).
ClBio: Bioavailability of Cl in a feed (%).
cMEng: Calf metabolizable energy (ME) (Mcal/kg).
cMEovercGE: cME / cGE which equals the quotient, q, in the calf energy equations.
cMg: Calf magnesium (% DM).
cMn: Calf manganese (% DM).
cNa: Calf sodium (% DM).
cNEg: Calf net energy for growth (NEg) (Mcal/kg).
cNEm: Calf net energy for maintenance (NEm) (Mcal/kg).
Co: Cobalt (mg/kg).
CoBio: Bioavailability of Co in a feed (%).
Coat: Adjustment to insulation due to wetness of coat. Depends on input CoatCond.
CoatCond: Input variable describing coat condition. Choices are clean/dry, some mud, wet/matted or covered with snow/mud.
ColdStr: Cold stress factor for computing the net energy requirement for maintenance with stress (Mcal/day/BW ^ 0.75).
COMP: Compensation effect for previous plane of nutrition. Used for heifers only.
CP: Crude protein (% DM).
CP(): Crude protein for a specific feed (g/day).
CPDigest: Crude protein (CP) digestibility coefficient.
cPh: Calf phosphorus (% DM).
CPgCalf: Crude protein required for growth for young calves (g/day).
CPmCalf: Maintenance crude protein requirement for young calves (g/day).
CPPreg: Crude protein requirement for pregnancy (g/day).
CP_RDP: Fraction of crude protein (CP) that is degradable (RDP).
CP_RUP: Fraction of crude protein (CP) that is undegradable (RUP).
CP_Total: Total crude protein (CP) intake (g/day).
CS: Condition score, 1 – 5 dairy scale.
cS: Calf sulfur (% DM).
cSe: Calf selenium (% DM).
CS5EBW: Empty body weight of animal at condition score 5 (kg).
CS9: Condition score, 1 – 9 scale used internally in the model.
CS_F(1 to 9): Factor to calculate reserves for body condition scores 1 to 9.
Cu: Copper (mg/kg).
CuBio: Bioavailability of Cu in a feed (%).
CW: Conceptus weight (kg).
Cys: Cysteine (% CP).
cZinc: Calf zinc (% DM).
DaysInMilk: Days in milk.
DailyMilk: Daily milk production (kg/day).
DaysPreg: Days pregnant (day).
DaystoChange: Number of days needed to increase or decrease one condition score (days).
DE: Digestible energy (Mcal).
DE_Total: Total DE intake (Mcal/day).
deltaER: Change in ER needed to increase or decrease one condition score (Mcal).
DietaryNFC: Total dietary non-fiber carbohydrate (NFC) (g/day).
DietCP: Fraction of crude protein (CP) in the diet.
DietCPCalf: Dietary CP for young calves (%).
DietDCPCalf: Dietary digestible crude protein for calves (%).
DietME: Quantity of ME in the diet (Mcal/kg).
DietMECalf: Dietary metabolizable energy (ME) (Mcal/kg).
DietNDF: Fraction of neutral detergent fiber (NDF) in the diet.
DietNEgCalf: Dietary NEg for young calves (Mcal/day).
DietNEmCalf: Dietary NEm for young calves (Mcal/day).
DietNEg: Quantity of NEg in the diet (Mcal/kg).
DietNEl: Quantity of NEl in the diet (Mcal/kg).
DietRUPDigest: Total RUP digestibility for the diet (weighted average).
DietTDN: Fraction of TDN in the diet.
DigArg_Flow: Flow of digestible arginine to the small intestine (g/day).
DigHis_Flow: Flow of digestible histidine to the small intestine (g/day).
DigIle_Flow: Flow of digestible isoleucine to the small intestine (g/day).
DigLeu_Flow: Flow of digestible leucine to the small intestine (g/day).
DigLys_Flow: Flow of digestible lysine to the small intestine (g/day).
DigMet_Flow: Flow of digestible methionine to the small intestine (g/day).
DigPhe_Flow: Flow of digestible phenylalanine to the small intestine (g/day).
DigThr_Flow: Flow of digestible threonine to the small intestine (g/day).
DigVal_Flow: Flow of digestible valine to the small intestine (g/day).
Discount: Factor used to discount energy value to adjust for intake.
Distance: Distance traveled between pasture and milking center to calculate activity requirement.
DM: Dry matter (% as Fed (AF)).
DMI(): Dry matter intake of a specific feed (kg/day).
DMIAvailGrowth: Dry matter available for growth (kg/day).
DMIActual: Actual dry matter intake (kg/day).
DMIDry: Dry matter intake of a dry cow (kg/day).
DMIforGrowth: Total dry matter intake used for growth (kg/day).
DMIforMECalf: Dry matter intake required to meet ME requirement of young calves (Mcal/day).
DMIforNEmCalf: Dry matter intake required to meet NEm requirement of young calves (kg/day).
DMIGrowth: Dry matter intake for growth (kg/day). qqq
DMILact: Dry matter intake of a lactating cow (kg/day).
DMIMaint: Dry matter intake required for maintenance (kg DM/day).
DMIPred: Predicted dry matter intake (kg/day).
DMIPreg: Dry matter intake required for pregnancy (kg DM/day).
DMI_RH: Dry matter intake of a replacement heifer (kg/day).
DMI_to_/DMIMaint: Ratio of DMI to DMI required for maintenance.
DMI_Total: Total dry matter intake (kg/day).
DryMatterIntake: Dry matter intake (kg/day).
dTotalMCPEndArg: Contribution of microbial and endogenous protein to the supply of digestible arginine (g/day).
dTotalMCPEndHis: Contribution of microbial and endogenous protein to the supply of digestible histidine (g/day).
dTotalMCPEndIle: Contribution of microbial and endogenous protein to the supply of digestible isoleucine (g/day).
dTotalMCPEndLeu: Contribution of microbial and endogenous protein to the supply of digestible leucine (g/day).
dTotalMCPEndLys: Contribution of microbial and endogenous protein to the supply of digestible lysine (g/day).
dTotalMCPEndMet: Contribution of microbial and endogenous protein to the supply of digestible methionine (g/day).
dTotalMCPEndPhe: Contribution of microbial and endogenous protein to the supply of digestible phenylalanine (g/day).
dTotalMCPEndThr: Contribution of microbial and endogenous protein to the supply of digestible threonine (g/day).
dTotalMCPEndVal: Contribution of microbial and endogenous protein to the supply of digestible valine (g/day).
e: Energy content of milk (Mcal NEl/kg).
EBG: Empty body weight gain (kg) equals 0.956 * SWG.
EBW: Empty body weight (kg) which equals 0.891 * SBW.
EBW(1 to 9): Empty body weight of the animal for specified condition score (1 to 9) (kg).
EffMEPreg: Efficiency of use of ME during pregnancy = 0.14.
EffMP_NPg: Efficiency of use of MP for NPg.
EffMPPreg: Efficiency of use of MP during pregnancy = 0.33.
EI: External insulation (Mcal/m^2 /deg C/day).
EnergyADGCalf: Energy allowable average daily gain for young calves (Mcal/day).
EnergyAllowableMilk: Amount of milk production possible based on energy available (kg/day).
EnergyEqClass: Feed description to select for appropriate routine for energy prediction. Choices are forage, concentrate and feed from animal sources (i.e. fish meal).
ER: Energy reserves of the animal at a specified condition score (1 to 9) (Mcal).
EQEBW: Equivalent empty body weight (kg) which equals 0.891 * EQSBW.
EQSBW: Equivalent shrunk body weight (kg).
EUN: Endogenous urinary nitrogen losses used in apparently digested protein calculations for young calves (g/day).
Fat: dietary fat (% DM).
FatDigest: Fat digestibility coefficient.
Fat_Total: Total fat intake (kg/day).
FCM: Fat corrected milk production (kg/day).
Fe: Iron (mg/kg).
FeBio: Bioavailability of Fe in a feed (%).
Fecal: Fecal endogenous loss of minerals.
FeedCategory: Feed groups. Choices are grass/legume forages, grain crop forages, energy sources, fats, plant protein feeds, animal protein feeds, by-product/other feeds, vitamins and mineral, and calf feeds (milk-based).
FeedMaint: Feed required for maintenance (kg DM/day).
FirstCalf: Age at first calving (months).
Flat: A pasture system in which cows move less than 200 m of vertical distance.
ForageDescrp: Forage description which is used to predict rate of passage. Choices are wet or dry.
ForageNDF: Fraction of forage neutral detergent fiber in the diet.
Gain1CS: Energy needed to gain 1 condition score (Mcal).
Growth: Growth requirement for minerals.
HairDepth: Effective hair depth (cm).
HeatStr: Heat stress factor for computing the net energy requirement for maintenance for replacement heifers based on the HeatStress variable. Applies to heifers only.
HeatStress: Heat stress description of breathing of heat-stressed animals. Choices are none, rapid/shallow, or open mouth. Applies to heifers only.
Hilly: A pasture system in which cows move 200 m of vertical distance. This increases the maintenance requirement 0.01 Mcal/kg BW for mature cows (^inconsistency with text 2-19-9). The adjustment is 0.02 * (SBW ^ 0.75) for heifers.
His: Histidine (% CP).
His_Flow: Flow of histidine to the small intestine (g/day).
HisPctMP: Histidine as a percent of metabolizable protein (%).
HP: Heat production (Mcal/m^2/day).
I: Iodine (mg/kg).
IBio: Bioavailability of I in a feed (%).
Ile: Isoleucine (% CP).
Ile_Flow: Flow of isoleucine to the small intestine (g/day).
IlePctMP: Isoleucine as a percent of metabolizable protein (%).
INS: Total insulation (Mcal/m^2/deg C/day).
K: Potassium (% DM).
KBio: Bioavailability of potassium in a feed (%).
Kd: Protein digestion rate (%/ hour).
Km: Diet NEl / DietNE is efficiency of use of ME for maintenance.
LactNum: Lactation number (integer).
Lactose: Lactose content of milk (%).
Lag: Week of lactation correction for dry matter intake of cows in early lactation.
LCT: Lower critical temperature (° C).
Leu: Leucine (% CP).
Leu_Flow: Flow of leucine to the small intestine (g/day).
LeuPctMP: Leucine as a percent of metabolizable protein (%).
Lignin: lignin (% DM).
Lose1CS: Energy needed to lose 1 condition score (Mcal).
Lys_Flow: Flow of lysine to the small intestine (g/day).
LysPctMP: Lysine as a percent of metabolizable protein (%).
Maint: Sum of the miscellaneous, fecal, urine and sweat losses for minerals.
MCP_Total: Total microbial crude protein (MCP) synthesis (g/day).
MEcs: Metabolizable energy required for cold stress (Mcal/day).
MEFGCalf: Metabolizable energy for growth for young calves (Mcal/day).
MEGrowth: Metabolizable energy for growth. Used for heifers only.
MEI: Metabolizable energy intake (Mcal/day).
MEng: Metabolizable energy (Mcal/day).
MEng_Total: Total ME intake (Mcal/day).
MEpreg: Metabolizable energy requirement for pregnancy (Mcal/day).
Met: Methionine (% CP).
Met_Flow: Flow of methionine to the small intestine (g/day).
MetPctMP: Methionine as a percent of metabolizable protein (%).
MFN: Metabolic fecal nitrogen. Used in calculations of apparently digested protein (ADP) for young calves (g/day).
Mg: Magnesium (% DM).
MgBio: Bioavailability of Mg in a feed (%).
Milk: Mineral requirement for milk production.
MilkDMI: Milk dry matter intake for young calves (kg/day).
MilkFat: Milk fat (%).
MilkProd: Milk production (kg).
MilkTrueProtein: True protein content of milk (%).
Misc: Miscellaneous loss component for minerals.
Mn: Manganese (mg/kg).
MnBio: Bioavailability of Mn in a feed (%).
MPBact: Metabolizable protein supplied by microbial protein (g/day).
MPEndo: Endogenous metabolizable protein (g/day).
MPFeed: Metabolizable protein supplied by the animal’s ration (g/day).
MPGrowth: Metabolizable protein required for growth (g/day).
MPLact: Metabolizable protein required for lactation (g/day).
MPMaint: Metabolizable protein required for maintenance (g/day).
MPPreg: Metabolizable protein for pregnancy (g/day).
MSBW: Mature shrunk body weight (kg).
MW: Mature weight (kg).
MW_From_Breed: Mature weight average for breed (kg).
Na: Sodium (% DM).
NaBio: Bioavailability of Na in a feed (%).
NDF: Neutral detergent fiber (% DM).
NDF(): Neutral detergent fiber for a specified feed (kg/day).
NDFDigest: Neutral detergent fiber (NDF) digestibility coefficient.
NDFIP: Neutral detergent insoluble protein (% DM).
NDF_Total: Total NDF (g/day).
NEDietConc: Concentration of net energy in the diet (kg DM/day).
NEFGCalf: Net energy available for growth for young calves (Mcal/day).
NEFP: Net energy for production (Mcal/day).
NEg: Net energy for growth (Mcal/day).
NEgOverMEng: NEg_Total / MEng_Total.
NEGrowth: Net energy for growth (Mcal/day)
NEGrowthDiet: Net energy for growth available in the diet (Mcal/day).
NEGrowthDietNS: Net energy for growth available in the diet with no stress (Mcal/day).
NEg_Total: Total NEg intake (Mcal/day).
NEl: Net energy for lactation (Mcal/day).
NEmOverMEng: NEm_Total / MEng_Total
NEl_Total: Total NEl intake (Mcal/day).
NElact: Net energy requirement for lactation (Mcal/day).
NElreq: Amount of dietary net energy that will be needed to increase 1 condition score (Mcal).
NElsub: Amount of energy retained that will be substituted for dietary NEl in order to lose one condition score (Mcal).
NEma: Net energy of diet for maintenance (Mcal). This value is assumed to be equal to the net energy value of the diet for lactation (NEl_Total).
NEmact: the factor added to the basal maintenance requirement to account for activity (Mcal/day).
NEMaint: Net energy required for maintenance for mature dry and lactating cows (Mcal/day).
NEMaintNS: Net energy required for maintenance without stress for heifers (Mcal/day).
NEmCalf: Net energy required for maintenance for young calves (Mcal/day).
NEpreg: Net energy required for pregnancy (Mcal/day).
NEReserves: Net energy required for replenishment of reserves or net energy available if reserves are mobilized (Mcal/ NEl/day).
NFCDigest: Non-fiber carbohydrate (NFC) digestibility coefficient.
NightCooling: Factor used to adjust dry matter intake of heat-stressed replacement heifers.
NPg: Net protein requirement (g/day).
P: Phosphorus (% DM).
PAF: Processing adjustment factor. Used to adjust for effects of processing on the non-fiber carbohydrdate (NFC) fraction.
PBio: Bioavailability of P in a feed (%).
PerEAA: Percent essential amino acids (%RUP).
Phe: Phenylalanine (% CP).
Phe_Flow: Flow of phenylalanine to the small intestine (g/day).
PhePctMP: Phenylalanine as a percent of metabolizable protein (%).
PrevTemp: Previous ambient temperature (° C).
ProteinAllowableMilk: Protein allowable milk (kg/day).
ProteinReqCalf: Protein allowable average daily gain (g/day).
PrtA: Fraction A of the crude protein that is non-protein nitrogen and a small amount of soluble true protein. (% CP).
PrtB: Fraction B of the crude protein that equals CP – PrtA – Prt C (% CP).
PrtC: Fraction C of the crude protein that is completely undegradable (% CP).
RD: Ration density of a mineral in the animal’s ration.
RDPBal: RDP balance (RDPReq – RDPSup) (g/day).
RDPReq: RDP required (g/day).
RDP_Sup: RDP supplied (g/day).
RDP_Total: Total ruminally degraded protein intake (g/day).
RDP(): Ruminally degraded protein for a specified feed (g/day).
RE: Net energy retained (Mcal/day).
Reserves_WG: Weight gain due to reserves (kg).
RUP(): Ruminally undegraded protein for a specific feed (g/day).
RUPDigest: Fraction of the rumen undegraded protein (RUP) that is digested (% RUP).
RUPBal: RUP balance (RUPReq – RUPSup) (g/day).
RUPReq: RUP required (g/day).
RUP_Sup: RUP supplied (g/day).
RUP_Total: Total RUP intake (g/day).
S: Sulfur (% DM).
SBio: Bioavailability of S in a feed (%).
SA: Surface area (m^2).
SBW: Shrunk body weight (kg) is 96% of full weight.
Se: Selenium (mg/kg).
SeBio: Bioavailability of Se in a feed (%).
SRW: Standard reference weight (kg). For replacement heifers, this number is 478 kg.
SRW_to_MSBW: Standard reference weight/ mature shrunk body weight (kg).
StarterDMI: Young calf intake of starter (kg/day).
SubFact: Age-related factor used to adjust intake of replacement heifers.
Supplied: Total quantity of a mineral supplied by the animal’s diet.
Sweat: Sweat loss component for mineral requirements.
SWG: Shrunk weight gain (kg).
T: Age in days.
TargetADGwoPreg: Target ADG without pregnancy (kg/day).
TargetADGPreg: Target ADG with pregnancy (kg/day).
TDN: Total digestible nutrients (% DM) at 1 X maintenance.
TDN(): Total digestible nutrients for a specified feed (g/day).
TDN_Act_Total: Actual discounted TDN intake (g/day).
TDN_ActX: Total digestible nutrients (TDN) adjusted for increment over maintenance intake.
TDN_Act(): Discounted total digestible nutrients for a specified feed (g/day).
TDN_Total: Total 1X-TDN intake (g/day).
Temp: Current temperature (° C).
TempFactor: The adjustment to the maintenance requirement for cold-stressed young calves.
TF(1 to 9): Total weight of fat at specified condition score (kg).
Thr: Threonine (% CP).
Thr_Flow: Flow of threonine to the small intestine (g/day).
ThrPctMP: Threonine as a percent of metabolizable protein (%).
TI: Tissue insulation (° C/Mcal/m^2/day).
Topography: Description of pasture. Choices are flat or hilly.
Total: Total quantity of mineral required.
TotalDigestedRUP: Total RUP digestibility for the diet (weighted average).
TotalDMFed: Total dry matter fed (kg/day).
TotalEAA: Total essential amino acids (g/day).
TotalMCPEndArgFlow: Contribution of microbial and endogenous protein to the flow of arginine to the small intestine (g/day).
TotalMCPEndHisFlow: Contribution of microbial and endogenous protein to the flow of histidine to the small intestine (g/day).
TotalMCPEndIleFlow: Contribution of microbial and endogenous protein to the flow of isoleucine to the small intestine (g/day).
TotalMCPEndLeuFlow: Contribution of microbial and endogenous protein to the flow of leucine to the small intestine (g/day).
TotalMCPEndLysFlow: Contribution of microbial and endogenous protein to the flow of lysine to the small intestine (g/day).
TotalMCPEndMetFlow: Contribution of microbial and endogenous protein to the flow of methionine to the small intestine (g/day).
TotalMCPEndPheFlow: Contribution of microbial and endogenous protein to the flow of phenylalanine to the small intestine (g/day).
TotalMCPEndThrFlow: Contribution of microbial and endogenous protein to the flow of threonine to the small intestine (g/day).
TotalMCPEndValFlow: Contribution of microbial and endogenous protein to the flow of valine to the small intestine (g/day).
TotalRegDMFed: Total regular (not milk-based) feed offered (kg/day).
TotalRUPArgFlow: Total flow of ruminally undegraded arginine to the small intestine g/day).
TotalRUPHisFlow: Total flow of ruminally undegraded histidine to the small intestine g/day).
TotalRUPIleFlow: Total flow of ruminally undegraded isoleucine to the small intestine g/day).
TotalRUPLeuFlow: Total flow of ruminally undegraded leucine to the small intestine g/day).
TotalRUPLysFlow: Total flow of ruminally undegraded lysine to the small intestine g/day).
TotalRUPMetFlow: Total flow of ruminally undegraded methionine to the small intestine g/day).
TotalRUPPheFlow: Total flow of ruminally undegraded phenylalanine to the small intestine g/day).
TotalRUPThrFlow: Total flow of ruminally undegraded threonine to the small intestine g/day).
TotalRUPTrpFlow: Total flow of ruminally undegraded tryptophan to the small intestine g/day).
TotalRUPValFlow: Total flow of ruminally undegraded valine to the small intestine g/day).
TP(1 to 9): Total weight of protein in the animal at specified condition score (kg).
Trips: Number of one-way trips a lactating cow travels between pasture and milking center daily.
Trp: Trytophan (% CP).
UndiscDE_Total: Total undiscounted DE intake (Mcal/day).
Urine: Urine endogenous loss component for minerals.
Val: Valine (% CP).
Val_Flow: Flow of valine to the small intestine (g/day).
ValPctMP: Valine as a percent of metabolizable protein (%).
VitA: Vitamin A (1000 IU/kg).
VitD: Vitamin D (1000 IU/kg).
VitE: Vitamin E (IU/kg).
WG: Weight gain (kg/day)
WindSpeed: Speed of wind (m/s). Maximum windspeed input is 32 kph.
WOL: Week of lactation. Used to predict intake in early lactation. (week).
Wt1st: Weight at first calving (kg).
Wt2nd: Weight at second calving (kg).
Wt3rd: Weight at third calving (kg).
YEn: Daily energy secretion in milk (Mcal NEl/day).
YFatn: Daily milk fat yield (kg/day).
YProtn: Daily milk protein yield (kg/day).
Zn: Zinc (mg/kg).
ZnBio: Bioavailability of Zn in a feed (%).
