| In this study, four concentrates were formulated with early indica paddy replacing com in basic concentrate in different levels (0%, 50%, 75%, 100%), which were fed on finishing stage of Dabie Mountain Beef Cattle, and the influence on the growth performance, carcass trait, slaughter performance of beef cattle was studied. Furthermore, a digestion trial and a degradation trial were conducted to provide evidences for the possibility of early indica paddy's application in the diets of finishing beef cattle. The experiment was divided into four parts:1. Beef cattle feeding trial: Twenty-four Dabie Mountain Beef Cattle were allotted to four groups (6 heads in each group) according to a randomized block design. The basic diet of beef cattle was later rice straw, and the ratio of concentrate to roughage was 6:4. In control group, the corn's proportion was 60% and early indica paddy's proportion was 0% in concentrate, while the levels of early indica paddy replacing corn were 50%, 75%, 100% respectively in group I, II, III. The results showed that with the increasing of early indica paddy proportion in the ration, the ADG of beef cattle were 539.95 45.38g, 536.99 34.50g, 542.46 54.48g and 500.00 32.47g respectively; The feed conversions were 5.41, 5.43, 5.37 and 5.89 respectively. There was no significant difference (P>0.05) in ADG and feed conversion among groups. However, the ADG and feed conversion of beef cattle in group n werethe best.2. Digestion trial: The nutrients apparent digestibility of diets was determined by incompletely collecting feces samples with 4N-HCL AIA as inner marker. The results showed that there were no significant difference on CP and NFE digestibility among groups (P>0.05). GE, DM and OM digestibility in group III (100% early indica paddy replacing com) were significantly lower than those of group II; EE digestibility of group II was significantly higher than those of control, group I (P<0.05) and extremely higher than that of group III (P<0.01); CF digestibility of group III was significantly lower than that of control group (P<0.05) and extremely lower man those of group I and group II (P<0.01), but there were no difference among control, trial I and trial II groups(P>0.05). In all, nutrients digestibility of group II were the best and those of group III were the worst.3. Slaughter trial: Hot carcass weight, dressing percentage, net meat percentage, meat-to-carcass percentage, meat-bone ratio, longissimus muscle area in 12-13 lib, the ratio of storing loss (48h) and the well done flesh ratio (48h) were determined. At the mean time, muscle nutrients content were also determined. However, there was no difference on all indexes among groups (P>0.05).4. Degradation trial: The degradability of CP, CF, NFE, DM and OM within 48h of concentrates and early indica paddy were determined by nylon bag technique through two Dabie Mountain Beef Cattle with everlasting fistula in rumen. The results suggested that: (1) The nutrients degradation property in group II was the best. Its effective degradability of CP, NFE, DM and OM were lower than those of other groups and providing more by-pass nutrients for the following digestive tract. The effective degradability of CP and NFE in group III were significantly higher than those of control, trial I and trial II groups. With earlyindica paddy content increasing in diets, the effective degradability of CF was decreased. (2) CP, NFE, DM and OM of early indica paddy degraded rapidly in rumen. Its degradable proportion had almost degraded within 12h. However, its CF was hardly degraded. The disappearance of CF was less than 15% at the 48h in rumen, and CF effective degradability of early indica paddy was 7.10% only.In this study, early indica paddy was directly applied in the diets of finishing beef cattle, and there were no such reports seen in China for the time being. The results suggested that there were no harmful influence on the growth performance, slaughter performance and carcass trait of beef cattle with early...
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