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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.

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