J. Anim Sci.
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J. Anim Sci. 1977. 44:112-117.
© 1977 American Society of Animal Science
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Digestibility by Steers of Grain Sorghum Stover and Wheat Straw Supplemented with NPN1

R. S. Swingle and L. B. Waymack

University of Arizona, Tucson 85721

Abstract

Two trials were conducted with growing steers to determine the digestibility and energy value of grain sorghum stover and wheat straw fed with a molasses-urea supplement (NPN method) and to compare digestion coefficients determined for stover in this manner with those determined when stover was fed as 20%, 40% or 60% of the diet with alfalfa hay (conventional method). Straw used in this study was from Cajeme 71, one of the recently developed short, stiff-strawed wheat varieties. Stover was from an unidentified grain sorghum hybrid. Digestion coefficients for energy and most proximate fractions of stover determined using the conventional method were lower (P<.05) when 20% stover was fed than when the diet contained 40% or 60% stover. Digestion coefficients for acid detergent fiber, nitrogen free extract and gross energy determined for stover using the NPN method were quite similar to those obtained at the higher stover levels by the conventional method. Digestion coefficients determined for crude protein and lipid by the two methods differed considerably and probably were not accurately determined by either method. Digestible energy determined for stover at the higher dietary levels was approximately 2,130 kcal/kg on a dry matter basis; TDN was 51%. Digestible energy and TDN for wheat straw were 2,000 kcal/kg and 45%, respectively.

Footnotes

1 Arizona Agricultural Experimental Station Technical Paper No. 2551.






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Copyright © 1977 by the American Society of Animal Science.