HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by Woody, H. D. Articles by Black, J. R. Search for Related Content PubMed Articles by Woody, H. D. Articles by Black, J. R.

Predicting Net Energy Value of Corn Silage Varying in Grain Content¹

Michigan State University, East Lansing 48824

Abstract

A 2-yr study was conducted to determine the relationships between acid detergent fiber (ADF), diet grain content, net energy (NE) value and performance of feedlot cattle. Regression equations were developed from pooled data involving 128 Charolais crossbred and Hereford steers fed diets that ranged in diet grain content from 30 to 96%. Acid detergent fiber was an adequate predictor of feedlot performance; it accounted for 78, 89 and 91% of the variation in gain, dry matter intake and feed efficiency, respectively. Diet grain content accounted for 87, 89 and 93% of the variation in gain, dry matter intake and feed efficiency, respectively. Diet grain content influenced ME (P = .02), NEm (P<.0005) and NEg (P<.0005). Corn silage containing 50% corn averaged 1.58 Meal NE_m/kg and 1.11 Meal NE_g/kg when fed alone, with a decrease of .06 Meal NE_m/kg and .05 Meal NE_g/kg for each 10 percentage unit decrease in corn grain content. Corn grain averaged 2.04 Meal NE_m/kg and 1.63 Meal NE_g/kg when fed in an all concentrate diet. When energy values were determined by analysis of silage and silage plus grain diets (30 to 70%) vs high concentrate diets (70 to 96%) ME, NE_m and NE_g were 2.9, 4.3 and 8.9% lower than predicted for 30 to 70% grain diets, and ADF and diet grain content accounted for only 33 and 23% of the variation in NE_g, respectively. In comparison, ADF and grain content accounted for 62 and 63% of the variation in NE_g when diet grain increased from 70 to 96%. These data suggest that discounting whole plant corn silage and corn grain NEm values by 4.3% and NEg values by 8.9% when total diet corn grain content is between 50 and 80% will adjust for associative effects.

¹ Michigan Agr. Exp. Sta. Journal Article No. 10041.

² Dept. of Anim. Ind., Southern Illinois Univ., Carbondale, IL.

³ Dept. of Anim. Sci., Cornell Univ., Ithaca, NY.

⁴ Dept. of Agr. Econ., Michigan State Univ., East Lansing, MI.

This article has been cited by other articles:

				B. W. Hess, G. E. Moss, and D. C. Rule A decade of developments in the area of fat supplementation research with beef cattle and sheep J Anim Sci, April 1, 2008; 86(14_suppl): E188 - E204. [Abstract] [Full Text] [PDF]