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A System for Expressing the Net Energy Requirements and Net Energy Content of Feeds for Young Sheep¹

University of California, Davis 95616

Abstract

DATA from four Comparative slaughter experiments, involving 203 whiteface lambs and 40 yearling wethers were used to develop a NE system for expressing energy requirements and feed values for young sheep. NE_m requirements were derived from fasting heat production which was estimated as 63.0 kcal/ W_kg^3/4. NE_g requirements for lambs were derived from the following regression of energy gain on body weight gain. Y=384.96X where Y is daily energy gain (kcal/W_kg^3/4) and X is daily weight gain (kg). Net energy values were estimated for the rations fed and were related to the ME content of the diet by the following regressions.

¹ We express our appreciation to D. C. Sumner and J. L. Hull, University of California, Davis, for providing the Sudan grass used in trials III and IV and to Patricia Ressler Tigg for her assistance in the conduct of trial I.

² Present address: Centro de Investigaciones Veterinarias, Maracay, Venezuela.

³ Present address: Centro de Investigaciones Agronomicas, Maracay, Venezuela.