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Acid or Alkali-Treated Hardwood Sawdust as a Feed for Cattle¹

University of Arkansas^,4, Fayetteville, 72701

Abstract

Hardwood sawdust was treated with solutions of NaOH and H₂SO₄, ranging in concentration from 1.0 to 2.5%, for 24 hours. ADF, cellulose, ash and IVDMD were increased (P<.01) by NaOH treatment, whereas, the lignin content was lowered (P<.01). No differences (P<.01) due to NaOH treatments occurred in GE, N and DM except DM was lowered by the 2.5% solution. The IVDMD was improved almost 100% by the 1.0% solution. DM, ADF, lignin and GE were reduced (P<.01) by the H₂SO₄ treatments. N, cellulose and ash were not affected. The highest IVDMD was obtained from sawdust treated with the 2.5% H₂SO₄ solution but was not statistically different from either 1.0% H₂SO₄ or 1.0% NaOH solutions. Holstein steers fed rations containing 25% untreated, 1.0% NaOH, or 1.0% H₂SO₄ treated sawdust for 85 days, had no differences (P<.01) in weight gains, feed intake, or feed efficiency. Thus, there was no economical advantage of treating hardwood sawdust with either NaOH or H₂SO₄ in this study.

¹ Published with the approval of the Director of the Arkansas Agr. Exp. Sta.

² Present address: Department of Animal Science, Purdue Univ., West Lafayette, Ind. 47907.

³ Department of Animal Sciences, University of Arkansas, Fayetteville, 72701.

⁴ Department of Animal Sciences.