Fungal strain and incubation period affect chemical composition and nutrient availability of wheat straw for rumen fermentation
Tuyen, Van Dinh ; Cone, J.W. ; Baars, J.J.P. ; Sonnenberg, A.S.M. ; Hendriks, W.H. - \ 2012
Bioresource Technology 111 (2012). - ISSN 0960-8524 - p. 336 - 342.
white-rot fungi - solid-state fermentation - in-vitro digestibility - pleurotus-ostreatus - ceriporiopsis-subvermispora - trametes-versicolor - sugarcane bagasse - detergent fiber - crop residues - animal feed
Eleven white-rot fungi were examined for their potency to degrade lignin and to improve the rumen fermentability of wheat straw. The straw was inoculated with the fungi and incubated under solid state conditions at 24 °C for 0–49 days to determine changes in in vitro gas production and chemical composition. Results show that some fungi could degrade lignin by as much as 63%, yet the delignification was highly correlated with the degradation of hemicellulose (r = 0.96). Reduction in lignin was poorly (r = 0.47), but the ratio between lignin and cellulose loss was strongly (r = 0.87) correlated with the increase in gas production. Treatment with Ceriporiopsis subvermispora for 49 days increased total gas production of the straw from 200 to 309 ml/g organic matter (OM). It was concluded that some fungi highly selective for lignin and not for cellulose are able to improve the nutritive value of wheat straw as a ruminant feed