1. Calculated Equations for corn silage:

Penn State:

Net energy of lactation (NEL) = 1.044 - (.0124 * ADF)

Total digestible nutrients (TDN) = 31.4 + (53.1 * NEL)

Estimated net energy (ENE) = 82.6 * NEL

Metabolizable energy (ME) = .01642 * TDN

Net energy of maintenance (NEM) = -.508 + (1.37 * ME) - (.3042 * ME * ME) + (.051 * ME * ME * ME)

Net energy of gain (NEG) = -.7484 + (1.42 * ME) - (.3836 * ME * ME) + (.0593 * ME * ME * ME)

NRC,2001:

NDF digestibility (NDFD)=dNDF48/NDF*100

NFC = 100-((NDF-2)+PROTEIN +FAT+ASH)

2. Calculated Equations for legume/grass hay and haylage:

Penn State:

NEL=1.044-(.0119*ADF)

TDN=4.898+(89.796*NEL)

ENE=82.6*NEL

ME=.01642*TDN

NEM=-.508+(1.37*ME)-(.3042*ME*ME)+(.051*ME*ME*ME)

NEG=-.7484+(1.42*ME)-(.3836*ME*ME)+(.0593*ME*ME*ME)

National hay Quality Testing Committee:

Digestible dry matter (DDM)=88.90-(.779*ADF)

D. Mertens, 46^th MN Nutr. Conf. pp209-223. 1985. (proc.)

Dry matter intake (DRYMI)=120/NDF

UW Madison – D. Rohweder and N. Jorgenson:

Relative feed value (RFV)=(DRYMI*DDM)/1.29

NRC, 2001 legumes and legume/grass mixture:

NDFD=dNDF48/NDF*100

Nonfibrous carbohydrate (NFC)=100-((NDF-2)+PROTEIN+FAT+ASH)

(Assumes 2% NDFCP)

NRC, 2001 grasses:

NDFD=dNDF48/NDF*100

Nonfibrous carbohydrate (NFC)=100-((NDF-2)+PROTEIN+2.5+ASH)

(Assumes 2% NDFCP and 2.5% Ether Extract (EE))

D. Undersander and J. Moore (2002):

Legume and legume/grass mixtures:

Relative forage quality (RFQ)=(DMI_Leg*TDN_Leg)/1.23

TDN_Leg=(NFC*.98)+(PROTEIN*.93)+((FAT-1)*.97*2.25)+((NDF-2)*(NDFD/100))-7

(Assumes 2% NDFCP.)

DMI_Leg=((((.0120*1350)/(NDF/100))) + ((NDFD-45)*.374)) /1350*100

Grass:

Relative forage quality (RFQ)=(DMI_grs*TDN_grs)/1.23

TDN_grs=(NFC*.98)+CP*.87)+(1.5*.97*2.25)+(NDFn*NDFDp/100)-10

DMI_grs=-2.318+0.442*CP-0.0100*CP²-0.0638*TDN+0.000922*TDN²+0.180*ADF-0.00196*ADF²-0.00529*CP*ADF (Moore and Kunkle, 1999)