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Utilization of Air-Separated Stem Fraction of Dehydrated Alfalfa Meal by Lambs¹

University of Illinois at Urbana-Champaign,² Urbana 61801

Abstract

Ruminant animals utilize fiber reasonably well; however, nonruminants such as poultry and swine do not utilize fiber efficiently. Consequently, the Nebraska Department of Economic Development and the Western Region Research Laboratory of U.S.D.A. (Chrisman et al., 1965) jointly developed the air-separation procedure for the separation of dehydrated alfalfa leaf and stem fractions. The dehydrated alfalfa leaf fraction is high in protein, carotene and xanthophyll and low in fiber. The residual stem fraction is relatively high (about 40 %) in crude fiber and low (about 13%) in crude protein and best suited for ruminant animals.

The following study evaluates the nitrogen balance and growth performance of young lambs on all-concentrate diets supplemented with the stem fraction of third-cut Ranger dehydrated alfalfa meal.

The 3.8 cmx 1.6 cm cubes of coarse fraction of air-separated dehydrated alfalfa meal (CASDAM) were coarsely ground before mixing with the feed. The composition of the CASDAM is in table 1.

¹ Stem fraction dehydrated alfalfa meal was supplied by Mr. Joseph Chrisman and Dr. G. O. Kohler of Western Utilization Research and Development Division, A.R.S., U.S.D.A., Albany, California.

² Department of Animal Science.