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Use of Ultraviolet Spectra Values Plus Phenol and Quaiacal to Predict Forage Nutritive Value¹

Michigan State University, ² East Lansing 48823

Abstract

Extracted lignins from sheep feces differed from that of the forage fed in several ultraviolet characteristics studied. Presumably these changes indicated a decrease in phenolic hydroxyl groups. Marked differences were noted between grasses and legumes with minor differences noted within grass or legume species. When these differences are interpreted as for wood lignins they indicate that legume lignins contain a greater ratio of phenolic hydroxyl groups to methoxyl groups than grass lignins. However, grass lignin contained quantitatively more ionized aromatic nuclei and phenol by most criteria than did legume lignin.

Multiple regression equations were developed using quantitative measurements from the U.V. spectra plus chemically determined phenol and quaiacol. These equations predicted dry matter digestibility or intake with a R² above 0.9. Because of the high prediction values and ease of quantitation, further study of the method is merited.

¹ Published with the approval of the Director of the Michigan Agricultural Experiment Station as Journal Article No.5694.

² Department of Dairy Science.