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J. Dairy Sci. 86:3992-3998
© American Dairy Science Association, 2003.

Influence of Nutrition Level on Digestibility in High Yielding Cows and Effects on Energy Evaluation Systems

M. Gabel*, B. Pieper{dagger}, K. Friedel*, M. Radke*, A. Hagemann*, J. Voigt{ddagger} and S. Kuhla{ddagger}

* Institute for Ecologically-Compatible Animal Husbandry, University of Rostock, D-18059 Rostock, Germany
{dagger} Dr. Pieper Technology and Product Development, D-16818 Wuthenow, Germany
{ddagger} Research Unit Nutritional Physiology "Oskar Kellner", Research Institute for the Biology of Farm Animals, D-18196 Dummerstorf, Germany

Corresponding author: M. Gabel; e-mail: martin.gabel{at}auf.uni-rostock.de.

The objective of the study was to determine the effect of nutrition level (NL, multiples of maintenance energy requirement) on the digestibility of nutrients for dairy cows regarding the energy supply of the animal. The digestion of nutrients and energy was investigated in two trials using lactating dairy cows. The NL varied from 2.7 to 5.0 using diets similar composition. In addition, sheep were given the same feed with a NL of 1.4. Digestibility of dry matter (DM) and all specific measures of dietary components declined significantly as NL increased. Digestibility of energy decreased by 4.1% for each increase in NL. The metabolizable energy, the ability to metabolize energy (metabolizable energy/gross energy), and the content of net energy for lactation (NEL) per kilogram of DM intake were calculated for NL from 1 to 6 on the basis of these relationships and as well as the gross energy, methane energy, and urine energy. Accordingly the NEL content declined by 0.11 MJ/kg of DM intake or 1.6% as the NL increased by one unit. It means that the NEL requirement above the maintenance requirement increased by 0.07 MJ of NEL per kilogram of fat-corrected milk, if the NL increased by one unit.

Key Words: digestibility • nutrition level • net energy for lactation

Abbreviation key: EE = ether extract, GE = gross energy, ME = metabolizable energy, NL = nutrition level






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