J. Anim Sci.
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J. Anim Sci. 1983. 56:476-482.
© 1983 American Society of Animal Science
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Evaluation of Slowly Degraded Proteins: Dehydrated Alfalfa and Corn Gluten Meal1,2,

D. W. Rock, T. J. Klopfenstein, J. K. Ward, R. A. Britton and M. L. McDonnell

University of Nebraska3, Lincoln 68583

Abstract

A system was developed for evaluation of protein sources in ruminant diets. Two steer growth trials were conducted to determine if the system would differentiate between protein sources. Corn cob, corn based diets were supplemented with urea or a test protein: soybean meal (SBM), a SBM bentonite complex (SBMB), direct cut dehydrated (DCD) or wilted dehydrated alfalfa (WD) or corn gluten meal (CGM). A combination of DCD and CGM was also evaluated (DCGM). Diets were 61% TDN and 11.5% crude protein equivalent (CPE). Experimental diets contained 20, 30, 40, 50 or 60% supplemental N from natural sources. Ad libitum intake of the urea-fed steers was used to establish the intake of all other steers, with corrections made for maintenance requirement. In trial 1, diets that were supplemented with SBM, DCD, WD or DCD corn gluten meal (DCGM) produced faster (P<.05) gains than diets in which urea supplied all the supplemental N (means averaged across all levels of natural protein). In trial 2, diets supplemented with DCD, SBMB, CGM or DCGM produced greater gains than diets in which urea was used as the supplemental N source. Animals supplemented with natural protein required less (P<.05) feed per unit of gain than did the urea supplemented animals. Protein efficiency, calculated as added gain per unit increase in natural protein above that produced by cattle fed the urea control were greater (P<.05) for the DCD, CGM and DCGM (.9, .7, .8) than SBM (.4).

Footnotes

1 Published as Paper Number 5992, Journal Series, Nebraska Agr. Exp. Sta.

2 This study was partly supported by the American Dehydrators Assoc, 6025 Metcalf Lane, Shawnee Mission, KS 66202.

3 Anim. Sci. Dept.






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Copyright © 1983 by the American Society of Animal Science.