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Lignin Excretion by Cattle Fed a Mixed Ration¹

U. S. Department of Agriculture^,3

Abstract

Lignin analyses of feces samples collected at three-hour intervals from beef heifers fed a mixed ration indicated only slight variations in lignin concentration during a 24-hour period. Four different feeding schedules showed no evidence of effect on fecal lignin excretion pattern.

Results of a digestion experiment using four beef steers indicated that an average of 87.1% of the lignin fed was recovered in the feces.

The lignin data are compared to the results of chromic oxide analyses of the same feces samples and the significance of the results in regard to the ratio technique of determining digestibility is discussed.

¹ Presented in part at the 52nd Annual Meeting of the American Society of Animal Production, Chicago, Illinois, November 26, 1960.

² The authors express their appreciation to C. Jackson, P. W. Kerns, J. R. Randall, and E. Riddle for technical assistance.

³ Beef Cattle Research Branch, AHRD, ARS, ARC Beltsville, Md.