The digestibility of wheat straw and wheat-straw pulp

Abstract

The composition and digestibility of wheat straw and wheat-straw pulp, i.e., straw treated with 1.5% NaOH for 22 hrs. at 10-15[degree] to increase its feeding value, are reported. Analysis by the standard and more detailed methods illustrate the mixed nature of the crude fibre and N-free extractives determined by the standard methods. The digestibilities of the straw constituents were increased by the alkali treatment; that of crude cellulose, was raised from 62.4 to 87.8%. The digestibility of the lignin declined from 102 to[long dash]0.5%. Since the cellulose of straw pulp is most probably digested to the extent of 88% in the rumen within 21/2 days, the results do not support McAnally''s suggestion (Biochem. Jour. 1942. 36. 392) that wastage occurs by too rapid passage through the rumen.