| Two experiments were included in this study. Test 1: Nutritive components often distribute into the different parts of the corn straw, it is important to analysis chemical elements of different parts and identify degradation of each part by cumulative gas production method in vitro, which assess the practicability of utilization of the different parts. The result showed:1 In the whole straw, leaf blade, stem marrow and stem skin of the corn straw, the content of DM is 94.7%, 94.6%, 94.6% and 95.1%, respectively. OM is 91.2%, 92.7%, 90.8 % and 93.4%, respectively. CP is 5.9%, 7.2%, 4.2% and 3.0%, respectively. Cellulose is 39.5%, 35.6%, 42.9% and 46.2%, respectively. Hemicellulose is 27.7%, 30.7%, 28.9% and 24.3%, respectively. Lignin is 5.7%, 4.2%, 4.3% and 9.4%, respectively.2 Cumulative gas production in vitro after 36 hours(ml/g OM)of the whole strain, leaf blade, stem marrow and stem skin of the corn straw is 127.5, 150.7,110.0 and 95.7, respectively.The result showed the nutritive components distribute into the different parts of the corn straw, it is practicable to segregate and utilize it.Test 2: basal diet which 85% corn straw is feed animal (first group) to research the effects of the forage- additive (second group) and pellet(third group) on feed intake and digestion metabolism of Duo lang sheep(n=6 in every group ).The result showed: the feed intake of basal diet group in dry matter (DM) organic matter (OM), crude protein (CP), cellulose(CEL),hemicellulose (HC) ,calcium, phosphorus and energy is 1231.6±240.0,1083.4±212.3,90.57±16.34,423.4±73.4,296.7±61.0,7.22±1.41,3.24±0.65 and 4966.1±972.6 respectively,and the digestibility is55.1%± 3.6,55.6%±3.6,41.39% ±5.8,56.6%±5.2,54.2%±2.5,11.8%±8.68,18.64%±4.76 and 55.8%±31.5 respectively. The deposition of CP, calcium, phosphorus is 21.46±6.3, 0.71±0.61 and 0.53±0.22 respectively. Forage-additive can increase the feed intake 8.9% (p>0.05), 8.3%(p>0.05), 23.11% (p>0.05), 10.97%(p>0.05),8.08% (p>0.05),14%(p>0.05),30.97% (p<0.05) and 7.95% (p>.05) respectively, the diet digestibility:6.6%(p>.05),6.95%(p>0.05), 29.99% (p<0.05),12.2% (p<0.05),13.0% (p<0.05,14% (p>.05),30.97(p<0.05) and 6%(p>.05) respectively, and the deposition of CP, calcium, phosphorus is 50.76%(p<0.01),76.03%(p<0.05) and 84.27% (p<0.05).The average daily gain weight of sheep is 173.4±37.5 gramme. Diet pellet can increase more 23.4% (p<0.05), 24.7% (p<0.05), 21.92% (p<0.05), 19.11% (p<0.05),8.08% (p>.05), 63.06% (p<0.01),23.59% (p<0.05) and 25.7% (p<0.05) than second group, respectively. The digestibility: -19.1% (p<0.05), -14.88% (p<0.05),-16.8%(p<0.05),-12.22%(p<0.05),-12.16%(p>.05),-36.06%(p>.05),-37.19%(p>.05) and -14.14%(p>0.05) respectively. The deposition of CP, calcium and phosphorus:13.82% (p<0.05),4.69% (p>.05) and -34.3% (p>.05), respectively. The average daily gain weight of sheep is 212.6 ±55.6 gramme.
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