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The Utilization of Alfalfa and Alfalfa Fiber Fractions by Growing Rats

Animal Husbandry Department, University of California, Davis

Experiments were designed to test the utilization of alfalfa and three alfalfa fiber fractions — namely, extracted alfalfa, holocellulose, and lignin — through the use of paired-feeding techniques, nitrogen balances, and digestibility. Alfalfa lignin was not utilized for weight gains or nitrogen retention but was digested to a small extent only when fed in conjunction with low-protein rations. Alfalfa holocellulose was not utilized for weight gains or nitrogen retention when fed with a high-protein ration but did support a small weight increase and nitrogen retention when fed with a low-protein ration. From 8 to 14% of the holocellulose was apparently digested.

Alfalfa extracted with water and a benzene-alcohol mixture was utilized to a very small extent as an energy source; however, its nitrogen was utilized. Approximately 12% of the organic matter of the extracted alfalfa was apparently digested. In comparison, the soluble constituents of alfalfa were important for weight gain and nitrogen retention. The soluble constituents were from 69 to 75% digested.