effect of heat processing on chemical composition, protein fractions and digestibility of broiler litter

effect of heat processing on the nutritive value of broiler litter, as a potential ruminant feedstuff,was studied in two pilot plans, processing through an assessment of chemical composition, proteinfractionation according to cncps as wells digestibility making use of tilley and terry method. in amanufactory located in the city of sabzevar. the average values of dry matter (dm), crude protein(cp), neutral detergent fiber (ndfom), acid detergent fiber (adfom), ash, ca, p, mg, k, na, fe,mn, cu and zn in the unprocessed broiler litter constituted 83.5% of the fresh matter, 26.4, 41.3, 14.2,18.6, 1.85, 0.97, 0.8, 1.0, 0.065 % of dm, 910.75, 332.73, 58.14 and 384.4 mg/kg of dm,respectively. these values for the processed litter, respectively, amounted to 92.9 % of fresh weight,25.5, 46.2, 14.4, 18.6, 1.74, 0.95, 0.72, 0.94, 0.062 % of dm, 1029.3, 304.25, 54.74 and 379.75 mg/kgof dm. as for the semnan manufactory, the average values for the unprocessed litter were,respectively,73.2 % of fresh weight, 28.8, 16.0, 17.2, 1.92, 1.13, 0.61, 1.1, 0.036 % of dm, 1328.6,374.0, 52.69 and 345.0 mg/kg of dm. fllowing the processing operations the mentioned valueschanged to 82.3 % of fresh weight, 28.3, 49.1, 18.5, 17.8, 1.86, 0.94, 0.60, 0.87, 0.035 % of dm,1598.2, 338.67, 51.15 and 302.6 mg/kg of dm, respectively. protein fractions a, b1, b2, b3 and c inthe unprocessed litter at sabzevar manufactory were, respectively 51.8, 18.5, 17.1, 7.13 and 5.01 % ofcp. the values for semnan manufactory were recorded as 50.3, 11.1, 24.6, 9.51 and 5.4 % of cp,respectively. after heat processing, accomplished and fot both manufactories, fractions a and b1 werereduced, wtereas b2, b3 and c increased (p0.05), except fordmd at sabzevar manufactory, which had singificantly decreased. the pressing method of processingreduced (p