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Conversion of
sorghum stover into animal feed with white-rot fungi:
Pleurotus ostreatus and Pleurotus pulmonarius
Akinfemi, A1*, Adu, O.A.2
and Doherty, F.3
1Department
of Animal Science, Faculty of Agriculture, Nasarawa State
University, PMB 135, Shabu-Lafia, Nasarawa State, Nigeria.
2Department
of Animal Production and Health, Federal University of
Technology, Akure, Nigeria.
3Department
of Biological Science, Yaba College of Technology, Lagos,
Nigeria.
*Corresponding author. E-mail:
akinjournal2000@yahoo.com Tel. +2348033371818.
Abbreviations: CP,
Crude protein; CF, crude fiber; NDF, neutral
detergent fiber; ADF, acid detergent fiber; ADL,
acid detergent lignin; POS, Pleurotus ostreatus;
PPT, Pleurotus sajor pulmonarius; NFE,
nitrogen free extract; OMD, organic matter
digestibility; ME, metabolisable energy; DM,
dry matter; PDA, potato dextrose agar; SCFA,
short chain fatty acid.
Accepted 22 December, 2009 |
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Treatment of crop residues with some species of white-rot
fungi can enhance the nutritive value. After the fungal
treatment of sorghum (Sorghum bicolor) stover with
two white-rot fungi in a solid state fermentation, the
chemical composition and in vitro digestibility of
the resultant substrate was determined. The results show a
significant (p < 0.05) increase in crude protein contents
from 2.54% for the control to 4.51% for Pleurotus
ostreatus (POS) and 4.59% for Pleurotus sajor
pulmonarius (PPT). The nitrogen free extract (NFE)
content also increased significantly (p < 0.05). The crude
fibre decreased significantly from 31.65% for the control to
27.49% for POS and 23.54% for PPS. There were also
consistent significant decreases (p < 0.05) in the values
obtained for NDF, ADF ADL. Significant differences were also
observed in the hemicellulose and cellulose contents.
Fermentation of the insoluble fraction (b) was enhanced by
the fungal treatment. Wide variations were also observed in
the mineral contents of the different substrates The
estimated organic matter digestibility (OMD) ranged from
42.99 to 57.75%, short chain fatty acid ranged from 0.56 to
0.94 µM and metabolisable energy (ME) ranged from 5.97 to
8.21 MJ/Kg DM. This result suggests that fungal treatment of
sorghum stover resulted in improved CP and digestibility,
hence its potential in ruminant nutrition.
Key words:
Chemical composition, crop residues, in vitro
digestibility, solid state fermentation, sorghum stover,
white-rot fungi. |
