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Nutritive Value of Acid Hydrolyzed Wood Residue in Ruminant Rations¹

Oklahoma State University, ^,4 Stillwater 74074

Abstract

Low acid (LA-HWR) and high acid (HA-HWR) hydrolyzed wood residues were produced by treating wood material (80% hardwood-20% pine) with 0.8% H₂SO₄ or 2.3% H₂S0₄, respectively, under pressure, and neutralizing with anhydrous ammonia. The products were mixed in varying proportions with a basal ration of alfalfa meal and fed to lambs in growth and digestion trials. Rations with hydrolyzed wood were tested with and without addition of soybean meal. Rations containing up to 75% LA-HWR were consumed well by growing lambs. There were no significant differences in weight gain of lambs fed 25 or 50% LA-HWR rations compared to lambs fed the basal ration. Dry matter/kg gain significantly increased as levels of LA-HWR increased over 25% in the diet. Supplementation of 75% LA-HWR rations with soybean meal significantly decreased dry matter/kg of gain requirements and increased weight gain. LA-HWR had a dry matter digestibility of 32%. Palatability factors limited the utilization of HA-HWR at more than 35% of the ration. Incorporation of HA-HWR at the 20 and 35% levels significantly decreased weight gain and dry matter digestibility compared to the basal ration. Cellulose digestion in dacron bags was significantly lower at the 30-hr. sampling period in animals fed 35% HA-HWR and SBM compared to digestion in lambs fed the basal ration. No significant differences were noted at 15 or 48 hours. Rumen ammonia was significantly higher in both lambs and steers consuming HA-HWR compared to those consuming the basal rations. VFA concentrations were not significantly influenced by HA-HWR.

¹ Journal Article J-2577 of the Agricultural Experiment Station, Oklahoma State University, Stillwater. This research was supported in part by Dierks Division, Weyerhaeuser Co., Hot Springs, Arkansas.

² Present address: Animal Science Department, Colorado State University, Fort Collins.

³ The authors gratefully acknowledge the assistance of M. McGeehon and S. Henderson with chemical analyses and R.W. Morrison with statistical analyses.

⁴ Department of Animal Sciences and Industry.