Nutritional Evaluation of Wheat Straw Incubated with the Edible Mushroom, Pleurotus Ostreatus

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Abstract
Studies were conducted to evaluate culturing of the edible mushroom Pleurotus ostreatus and the bacterium Erwinia carotovora on wheat straw as a means of improving the nutritive value of straw for ruminant animals. In vitro dry matter digestibility (IVDMD) of the straw was not improved (P>.05) by incubating the straw with P. ostreatus alone. However, 56-d incubations at 50% dry matter (DM) with P. ostreatus and E. carotovora increased (P<.05) IVDMD from 32.7 to 47.7%. Preheating or autoclaving the straw before inoculation was found not to be necessary. The IVDMD of the straw was improved more consistently when the straw was incubated at 50% DM rather than at 33 or 25% DM. DM decomposition of the straw ranged from 28.8 to 55.9%. Neither particle size nor substrate to inoculum ratio affected (P>.05) IVDMD. Lignin decomposition of 10 g of straw preheated at 25 C and incubated at 25 C and 50% DM for 56 d was 69%, which was intermediate to that of hemicellulose, at 83%, and cellulose, at 55%. It is believed that such biodelignification and the concurrent 15-percentage unit increase in IVDMD indicate that the culturing of P. ostreatus and E. carotovora on straw may, in fact, improve the straw's nutritive value for ruminant animals. Copyright © 1982. American Society of Animal Science . Copyright 1982 by American Society of Animal Science. Printed in USA. All rights reserved. Reproduction in part or whole probihited.

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