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Net Energy Requirements of Ewe Lambs for Maintenance, Gain and Pregnancy and Net Energy Values of Feedstuffs for Lambs

University of California,¹ Davis 95616

Abstract

The comparative slaughter technique was used with 54 white-face ewe lambs to determine their NE requirements, on diets of 2.58 and 2.35 kcal ME/gDM, respectively. The ME was utilized with efficiencies for maintenance, gain and pregnancy of 64.9% and 63.0%, 47.8% and 40.6%, and 17.5% and 16.0%, respectively, for the high and low energy diets. The NE_m was 1.67 and 1.48 kcal/gDM, NE_g was 1.23 and 0.95 kcal/gDM and NE_preg was 0.45 and 0.38 kcal/gDM for the high and low energy diets, respectively. The daily NE_m requirement was 64.4 kcal/ W_kg, and the daily NE_g requirement was 428 kcal/Ag gain/W_kg. The NE values of the diets were incorporated into the following regressions for predicting NE values (kcal/gDM) of a diet from its ME content (kcal/gDM).

¹ Department of Animal Science.

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