J. Anim Sci.
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J. Anim Sci. 1976. 43:1044-1048.
© 1976 American Society of Animal Science
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Net Energy Values of Corn and Corn Silage Fed in Various Combinations to Steers Slaughtered at 341,454 and 545 KG1

George W. Jesse2, G. B. Thompson and J. L. Clark3

University of Missouri,4, Columbia 65201

Abstract

A comparative slaughter technique was employed to determine the net energy values of corn and corn silage fed in ration combinations of 30:70, 50:50, 70:30 and 80:20 (corn xorn silage — DM basis) to Hereford steers slaughtered at 341, 454 and 545 kilograms. Eight steers were slaughtered initially (227 kg) to determine empty body energy and 48 steers individually fed utilizing a three by four factorial design with four animals per cell. Maintenance requirements (Meal/day) were estimated by the following formula: NEm = .077
Figure 1
and book values (NEm) of 2.28, 1.56 and 1.93 Meal per kilogram of corn, corn silage, and soybean oil meal were assumed.

Regression analyses were used to estimate corn and corn silage net energy values (NEg) from ration net energy values where energy retention was determined by bomb calorimetry.

Ration net energy values were not different (P<.05) by treatment although the values were greatest for the high corn ration (80:20 corn to corn silage). Net energy for gain values for corn and corn silage were 1.17 and 1.05 Mcal/kg, respectively. An increase was noted in the net energy value of corn as slaughter weight increased; however, this may be an artifact due to erroneous assumptions with regard to NEm values and daily maintenance requirements with varying weather conditions.

Footnotes

1 Contribution from the Missouri Agricultural Experiment Station. Journal Series No. 7368. Approved by the Director.

2 Present address: Department of Animal Science, Texas A&M University, College Station.

3 The authors wish to thank Dr. D. P. Hutcheson for his assistance with the statistical analysis, Mr.Keith Weimer and Mr. Logan McClelland for feeding the steers and collecting the raw data, and Dr. W. H. Pfander and others for the determination of bomb calorimeter values.

4 Department of Animal Husbandry.






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Copyright © 1976 by the American Society of Animal Science.