Utilization of spent mushroom (Volvariella volvacea Bull.) substrate as feed for sheep.
1988
Mojica R.E.
Some selected laboratory techniques and digestion trials on 4 male sheeps were conducted to determine the chemical composition and nutritive value of unused and spent mushroom substrates. The substrates used were unused rice straw (65%) and banana leaves (35%) (URB); spent rice straw (65%) and banana leaves (35% (SRB); unused banana leaves (UB); spent banana leaves (SB). Based from proximate components, the crude protein contents of URB and SRB were almost the same while that of SB was higher than that of UB. A lower crude fiber, ether extract, nitrogen free extract and organic matter were noted in spent substrates. These have also a higher neutral detergent fiber, acid detergent fiber, lignin and silica content. The roughage dry matter intake of sheep was highest in SRB followed by URB, UB and SB rations. The highest dry matter intake was less than 2% of body weight. Most of the animals exhibited a negative nitrogen balance that caused the loss in body weight because of a low nitrogen intake. Only animals receiving unused rice-straw-banana leaves combination had a positive N-balance. Lower digestion coefficients were observed in spent substrates, although no treatment differences were observed. URB had a higher dry matter digestibility of 50.24% while SRB had the lowest with 39.62%, suggesting that unused substrates were more digestible than the spent. The in vitro dry matter digestibility was highest in URB (63.6%) and lowest in SB (51.69%) while the IVOMV In Vitro Organic Matter Digestibility value was highest in URB and lowest in UB. The TDN Total Digestible Nutrients value were 49.14, 46.26, 40.97 and 37.2% for UB, URB and SRB rations, respectively.
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