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Associative Effects on the Digestibility of Energy and the Utilization of Nitrogen in Sheep Fed Simplified Rations¹

Utah State University, Logan 84321

Abstract

Concomitant feeding of alfalfa hay and dried molasses beet pulp in equal amounts resulted in an increase in the digestibility of EE and NFE and a decrease in the biological value of nitrogen as compared to the digestibilities when each feed constituted the sole ration. The calculation of digestion coefficients by difference gave even more divergent results. The digestibilities of DM, GE and N were significantly higher at the lowest level of energy for all rations. When digestion coefficients were calculated by difference there was an increase in the digestibility of DM, GE, N and CF and a decrease in biological value and N retention at the lowest level of intake. Metabolic nitrogen was found to be 5.64± 0.11 g N per kilogram dry matter intake. Endogenous nitrogen was 0.07 gN per W_kg^.75 per day.

¹ This investigation was supported in part by the Public Health Service Research Grant UX-OO679-O7 from the Division of Environmental Engineering and Food Protection. Report on Project 604, Journal Paper No. 1008.

² Research Associate and Professor of Nutrition, respectively.

³ Present address: University of Missouri, Columbia.