effect of two fungui (phanerochaete chrysosporium and pleurotus ulmarius) on chemical composition and degradability of alnus subcordata saw dust as ruminant feed

this study was carried out to determine the chemical composition and degradability parameters of dm, adf and ndf in alnus subcordata saw dust (sd) biodegraded by phanerochaete chrysosporium and pleurotus ulmarius fungi. the sd samples were incubated by the fungi at 30 ± 1˚c and 65 ± 5% relative humidity for 7 and 17 days. biodegraded samples were sterilized to constant activity and oven dried for chemical composition and rumen degradability using of two ruminal cannulated moghani male sheep, for this purpose.  results showed that, biological treatments decreased the ndf, adf and ash contents of the substrate. the rumen degradability of dm, adf and ndf as well as soluble fraction (a), non soluble but degradable (b) fraction, degradability rate (c) and effective degradability (ed) in different times of biodegradation were increased (p<0.05) as a result of biological treatments. period of biological treatment had significant effect on the biodegradability rate as the highest amount of biodegradability was found at 17 days of incubation where the lowest values were in control samples