determining of degradation and digestion coefficients of canola meal using of in situ and gas production techniques

this study was carried out to the determination of nutritive value of canola meal using naylon bag and cumulative gas production techniques in gizel sheep. tow fistulated gizel sheep with average bw 45±2 kg used in a complete randomized design. the cumulative gas production was measured at 2, 4, 6, 8, 12, 16, 24, 36 and 48 h and ruminal dm and cp disappearance were measured up to 96 h. coefficients of soluble cp degradation of canola meal (a), canola meal treated with 0.5% urea (b) and canola meal treated with micro wave (c) were 4.74, 15.81 and 15%, and for fermentable portion were 31.05, 39.62 and 65.55%, respectively. the cumulative gas production of soluble and insoluble portions (a+b) were 252.13, 213.57 and 240.88 ml/g dm. metabolizable protein of treatments a, b and c were 283.11, 329.33 and 284.39 g/kg dm, that were not significantly different. the relationship between dry matter and cumulative gas production values for treatments obtained about 0.958, 0.976 and 0.932 and this parameter for crude protein and cumulative gas production achieved 0.987, 0.994 and 0.989, respectively. high correlation between in situ and cumulative gas production techniques indicated that digestibility values can be predicted from cumulative gas production data.