J. Anim Sci.
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J. Anim Sci. 1974. 38:140-148.
© 1974 American Society of Animal Science
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An Evaluation of Methods for Improving the in vitro Digestibility of Rice Hulls1,2,

Narong Hutanuwatr3,4,, F. C. Hinds5 and C. L. Davis6

University of Illinois at Urbana-Champaign, Urbana 61801

Abstract

The low feeding value of ground rice hulls (GRH) can possibly be accounted for by its very low water-soluble nutrient content (4% of total dry matter (DM)) and relatively high contents of silica (22% of total DM) and lignin (11% of total DM). NaOH treatments increased in vitro dry matter disappearance (IVDMD) of GRH from 5 to 10% of initial DM to 26 to 40% of residue DM.

In order to obtain microbial degradation of treated rice hulls (RH), washing after a NaOH treatment was necessary, particularly at 12% NaOH or higher.

Washing the NaOH-treated GRH removed a considerable amount of DM from the original GRH (26 to 28% of total DM from a 12% NaOH level). More than 50% of the DM washed out was found to be silica, while little or no lignin was removed. This indicated that the response to washing in increasing IVDMD (actually microbial degradation) was caused by the removal of the dissolved silica.

Footnotes

1 The authors wish to express their sincere thanks to Dr. R. E. Brown, who helped to initiate this study and to the Arkansas Rice Grower Cooperative Association, who provided rice hulls used in this study.

2 Supported in part by Federal Hatch funds (20-348).

3 Department of Animal Science, Khon Kaen University, Thailand.

4 Submitted in partial fulfillment of the requirements for an M.S. degree, University of Illinois at Urbana-Champaign.

5 Department of Animal Science, University of Illinois at Urbana-Champaign.

6 Department of Dairy Science, University of Illinois at Urbana-Champaign.






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Copyright © 1974 by the American Society of Animal Science.