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When evaluating a dairy ration, what do the letters TDN stand for?(a) Total Diet Needed(b) Tested Digestible Nutrients(c) Total Digestible Nutrients(d) The Dairy NetworkThe question was posed to me in an international level competition.My question is taken from Cattle Health in portion Cattle Health of Dairy Engineering

Answer» RIGHT choice is (c) Total DIGESTIBLE Nutrients

To elaborate: Total digestible nutrients (TDN) are another method of expressing the energy content of FEEDS or the energy REQUIREMENTS of CATTLE. TDN is comparable to digestible energy. It has been in use longer than the net energy system and more values are available for feedstuffs.


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