Two published equations and four derived equations
that predict dietary energy from dietary crude or acid detergent
fiber were evaluated for accuracy. The equations estimated
total digestible nutrients, digestible energy,
metabolizable energy or net energy lactation of diets of
cows completing 480 lactations in which mean dietary
crude fiber varied among seven dietary groups from 17 4 to
225 g crude fiber per kilogram of dry matter consumed. Intakes
of available dietary energy were compared against
feeding standard requirements. Mean quotients obtained
by dividing energy intakes from equations by energy requirements
(concurrence values) varied from 1.00 to 1.05
among equations. Concurrence values decreased as dietary
Available dietary energy content expressed in any common
energy term was accurately predicted from dietary
fiber for full-fed milking Holsteins through use of equations
presented in the text.
Prediction of Available Energy in Dairy Cow Rations from Dietary Fiber.
Minnesota Agricultural Experiment Station.
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