FEBCj is the amount of bacterial carbohydrate in feces from the jth feedstuff, g/day;

FEBFj is the amount of bacterial fat in feces from the jth feedstuff, g/day;

FEBASHj is the amount of bacterial ash in feces from the jth feedstuff, g/day, and

FEBACTj is the amount of bacteria in feces from the jth feedstuff, g/day.

Endogenous protein, carbohydrate and ash are:

where

DMI is feed DM consumed, g/day;

FEENGPj is the amount of endogenous protein in feces from the jth feedstuff, g/day;

FEENGFj is the amount of endogenous fat in feces from the jth feedstuff, g/day;

FEENGAj is the amount of endogenous ash in feces from the jth feedstuff, g/day, and

IDMj is the indigestible dry matter, g/day.

Total fecal DM is calculated by summing protein, carbohydrate, fat and ash DM contributions from undigested feed residues, microbial matter, and endogenous matter:

where

FEPROTj is the amount of fecal protein from the jth feedstuff, g/day;

FECHOj is the amount of carbohydrate in feces from the jth feedstuff, g/day;

FEFATj is the amount of fat in feces from the jth feedstuff, g/day;

FEASHj is the amount of ash in feces from the jth feedstuff, g/day, and

FEDMj is the amount of fecal DM from the jth feedstuff, g/day.

Total Digestible Nutrients and Energy Values of Feedstuffs

Apparent TDN is potentially digestible nutrient intake minus indigestible bacterial and feed components appearing in the feces:

where

TDNAPPj is apparent TDN from the jth feedstuff, g/day.

The ME values for each feed are based on assuming 1 kg of TDN is equal to 4.409 Mcal of DE and 1 Mcal of DE is equal to 0.82 Mcal of ME (NRC, 1976):

where

MEaj is metabolizable energy available from the jth feedstuff, Mcal/day;

MECj is metabolizable energy concentration of the jth feedstuff, Mcal/kg;

MEI is metabolizable energy supplied by the diet, Mcal/day, and

MEC is metabolizable energy concentration of the diet, Mcal/kg.

CALCULATION OF NET ENERGY VALUES

where

NEgaj is net energy for gain content of the jth feedstuff, Mcal/kg;

NEmaj is net energy for maintenance content of the jth feedstuff, Mcal/kg;

METABOLIZABLE PROTEIN

Total feed MP is the sum of each feed MP:

where

MPaj is metabolizable protein from the jth feedstuff, g/day, and

MPa is metabolizable protein available in the diet, g/day.



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