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. NEm requirements were derived from fasting heat production which was estimated as 63.0 kcal/ Wkg3/4. NEg 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/Wkg3/4) 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.
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Rattray et al. (1973) studied this question.