J. Anim Sci.
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J. Anim Sci. 1979. 48:1447-1456.
© 1979 American Society of Animal Science
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Net Energy Evaluation of Barley Diets for Cattle in Cold Environments1

A. Suleiman2 and G. W. Mathison2

University of Alberta, Edmonton Alberta, Canada T6G 2E3

Abstract

Four feeding trials were conducted in two consective summer and winter feeding periods to evaluate the effects of a cold environment on the net energy value of barley grain.

Steers tended to gain more live weight than predicted by the California Net Energy System (CNES) in both summer and winter even though daily energy retention tended to be less than predicted. Empty body weight gains tended to be closer to predicted gains than 16-hr shrunk-weight gains. The determined NEg content of barley in an all-concentrate diet was 1.39 Meal/ kg of dry matter in the two summer feeding periods. A mean value of 1.03 Mcal/kg was obtained in the two winter periods. This difference could only partially be accounted for by a decreased digestibility of the diet in a cold environment, but was closely correlated with the percentage of energy retained as fat.

The NEm content of barley was estimated to be 1.82 or 1.91 Mcal/kg of dry matter depending upon the method used. Season had no major apparent effect on the NEm content of barley.

Steers appeared to use the digestible energy from wheat straw with efficiencies comparable to that from all-concentrate diets when energy intakes were slightly above maintenance. There was no evidence that straw had a higher net energy value in winter than in summer.

Footnotes

1 This research was supported in part by the National Research Council of Canada.

2 Department of Animal Science.






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Copyright © 1979 by the American Society of Animal Science.