玉米秸秆及青贮饲料的细胞壁成分体外消化性能比较

Comparision of Digestibility and Digestion Rate of Organic Cell Wall in Cornstalk Silage and Cornstalk as Deterimined by the Digestion Trial

利用体外消化试验法,对吉单4011和四单29两品种玉米的秸秆和青贮饲料进行了干物质和细胞壁成分的消化率和消化速度常数的测定,吉单4011的干物质(DM)和细胞壁成分(OCW)的有效消化率分别是57.4%和48.9%,吉单29分别是58.8%和53.9%。两品种玉米青贮饲料OCW的消化速度常数显著高于秸秆,吉单4011的秸秆和青贮饲料分别为4.85%和4.52%,吉单29分别为5.81%和7.11%。结果表明,通过青贮,可以提高玉米秸秆细胞壁的消化率和消化速度常数,秸秆中OCW含量高的玉米品种更适合青贮。

Cornstalk silages of two varieties namely Jidan4011 （JD4011） and Sidan29 （SD29） were prepared with banker-silo. Digestibility and digestion rate （k） of organic cell wall （OCW） of cornstalk silage and cornstalk in the rumen were determined with in vitro method . The potential digestibility of DM and OCW of cornstalk silage was 57.4%, 48.9% for JD4011, and 58.8% ,53.9% for SD29, respectively . The k value of OCW was markedly increased by ensiling and the respective value for the two types were 4.52% and 4.85% for the silage and cornstalk of JD4011, and 5.81% and 7. 11% for the silage and cornstalk of SD29. The results confirmed that digestibility and digestion rate of OCW in cornstalk were improved by silage fermentation , the cornstalk with high OCW content was selected to make silage.