Nutritive Value of Wheat Straw Treated with Pleurotus Fungi

  • Fazaeli, H. (Animal Science Research Institute) ;
  • Mahmodzadeh, H. (Department of Animal Science, Faculty of Veterinary, University of Tehran) ;
  • Azizi, A. (Agricultural Engineering Research Institute) ;
  • Jelan, Z.A. (Department of Animal Science, Faculty of Agriculture) ;
  • Liang, J.B. (Department of Animal Science, Faculty of Agriculture) ;
  • Rouzbehan, Y. (Tarbiat Modarres University, Faculty of Agriculture) ;
  • Osman, A. (Department of Animal Science, Faculty of Agriculture)
  • Received : 2003.11.07
  • Accepted : 2004.06.04
  • Published : 2004.12.01


Soaked and pasteurised wheat straw was inoculated with five species of Pleurotus fungi (coded P-21, P-30, P-41, P-60 and P-90), packed in polyethylene bags and incubated in a fermentation chamber for 21 days. The chemical composition, in vitro digestibility and in sacco degradability of the treated and untreated straw were estimated using a complete randomised design consisting of six treatments and four replicates. In a feeding trial, in vivo digestibility and voluntary intake were determined in bulls, using a $3{\times}3$change over design. Dietary treatments were: 1) untreated wheat straw (UWS) as control; 2) fungal treated (P-41) wheat straw before mushroom formation (FTWS); 3) spent wheat straw (SPWS) after mushrooms were harvested. Apart from P-90, fungal treatment significantly (p<0.05) increased the crude protein (CP) and reduced the cell wall components of the straw. The in vitro dry mater and organic mater digestibility significantly (p<0.05) increased in the treated straw particularly with the treatments of P-41 and P-60. The in situ degradability and in vivo digestibility of DM and OM were significantly (p<0.05) increased in treated straws with the highest values observed for treatment P-41. The intake of DM, OM and digestible organic mater (DOM) were significantly (p<0.05) increased in cows fed FTWS.


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