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Journal of Dairy Science Vol. 69 No. 9 2334-2341
© 1986 by American Dairy Science Association ®
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Utilization of Alfalfa Hay and Alfalfa Silage. 1. Protein Sources in Corn Silage-Based Diets1

T. L. Mader, D. E. Pankaskie2, T. J. Klopfenstein, R. A. Britton and V. W. Krause3

Department of Animal Science, University of Nebraska Northeast Center, Concord 68728

ABSTRACT

Different amounts of alfalfa as hay or silage were compared with soybean meal or urea as protein sources for steers fed corn silage-based diets. Source of alfalfa and source by amount interactions were not significant when alfalfa was fed as hay or silage at 32, 63, or 100% of dry matter in trial 1. A highly significant linear response in average daily gain and gain to feed ratio was observed to alfalfa amounts. Daily gain (.90 vs. .87 kg) and gain to feed ratio (.139 vs. .136) were very similar when diets were formulated to meet protein requirements with 32% alfalfa as either hay or silage.

In trial 2, supplemental protein for steers fed corn silage was provided by alfalfa hay or silage at 12 or 50% of diet dry matter or by soybean meal or urea. The 12% alfalfa diet contained equal parts of supplemental protein from alfalfa and from urea. Regression analyses indicated that supplementation of either alfalfa hay or silage with urea did not improve utilization of corn silage. Differences in fiber and protein fractions resulting from harvesting and storage of alfalfa as hay or silage do not change the value of alfalfa as a protein source when used in corn silage-based diets.

FOOTNOTES

1 Journal Paper Number 7853, University of Nebraska Agricultural Research Division.

2 Farmland Industries, Kansas City, MO 64116.

3 Land O'Lakes, Fort Dodge, IA 50501.






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Copyright © 1986 by the American Dairy Science Association ®.