Effects of Using Crude Glycerin with Roughage Source in Total Mixed Ration Diets of Feedlot Steers on Gas Production by in vitro Gas Production Technique
Keywords:
Crud glycerin, Gas production, Methane production, in vitroAbstract
This study was conducted to evaluate effects of crude glycerin with roughage sources in diets of feedlot steers on gas production and methane by using in vitro gas production technique. The experiment was determined according to 2x4 factorial arrangements in completely randomized design (CRD). Two factors were of roughage sources (rice straw and napier grass) and crude glycerin level (0, 6, 12 and 18 %). The result showed that roughage sources and level of crude glycerin were no interaction between roughage source and crude glycerin levels on cumulative gas production and kinetics gas production. Gas production from the immediately soluble fraction (a), insoluble fraction (b), and rate of gas production from insoluble fraction (c) were not differences (P>0.05) among treatments. Gas production at 72 h after inoculation for rice straw with 0, 6, 12 and 18 % crude glycerin and napier grass with 0, 6, 12 and 18% of crude glycerin was 147.5, 150.3, 145.8, 144.1, 148.2, 146.1, 146.1 and 145.6 ml/0.5 g.DM, respectively. Moreover, total CH4 and CO2 production did not differ among treatment (P>0.05). This indicated that crude glycerin could be used as an alternative feedstuff for energy sources up to 18% of DM in diets without any effect on total gas production and CH4.
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