total digestible nutrients


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total digestible nutrients

an outmoded method of expressing the energy value of a feed; abbreviated TDN. Estimated as follows:
$$\rm %TDN={{DCP+DCF+DNFE+(DEE\times2.25)} \over {feed \ consumed\times100} }$$
where DCP = digestible crude protein, DCF = digestible crude fat, DNFE = digestible nitrogen-free extract, DEE = digestible ether extract.
One pound of TDN = 2000 kcal of digestible energy.
References in periodicals archive ?
Physiological parameters, total digestible nutrients, and digestible crude protein intakes, and milk production in hot environment
6 TMR, total mixed rations (as fed basis); WDG; wet distillers grains; DM, dry matter; CP, crude protein; EE, ether extract; CF, crude fiber; NDF, neutral detergent fiber; ADF, acid detergent fiber; TDN, total digestible nutrients.
Nonfibrous carbohydrates (NFC) were estimated according to the equations described by NRC (2001): NFC (% of DM) = 100-(CP+ether extract [EE]+NDF+ash) and the observed total digestible nutrient (TDN) were estimated according to the following equation: TDN = dCP+(2.

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