不同粗饲料在肉羊瘤胃中的降解特性研究

Ruminal Degradability Characteristics of Different Roughages for Sheep

为了研究玉米秸秆、山药蔓、醋糟和秕谷4种粗饲料的营养成分及在肉羊瘤胃中的降解特性,选用3只体况相近且安装永久瘤胃瘘管的杜寒杂种成年竭羊,采用尼龙袋法测定这些粗饲料的干物质(DM)、有机物(OM)、粗蛋白质(CP)、中性洗涤纤维(NDF)、酸性洗涤纤维(ADF)的含量及其瘤胃降解参数。结果表明:醋糟的CP、EE及消化能(DE)、代谢能(ME)、增重净能(NEg)均高于其他3种粗饲料,而其CF、NDF、ADF含量最低。4种粗饲料各营养成分的瘤胃降解率随滞留时间的增加而增加,最终趋于稳定。醋糟的DM、CP、OM、NDF和ADF的有效降解率均显著高于其他3种粗饲料(P<0.05),说明醋糟较其他3种粗饲料作为肉羊粗饲料相对饲用价值更高。

In order to investigate the nutritional value and ruminal degradability of four different roughages： corn straw, yam vine, vinegar residue and blighted grain, three Dorper x Han crossbred wethers fitted with permanent rumen fistula were selected, and nylon-bag technique was used to evaluate the ruminal degradability characteristics of dry matter（ DM ）, organic matter（ OM ）, crude protein （ CP ）, neutral detergent fiber （NDF） and acid detergent fiber （ ADF ）. Besides, common nutrition components of the roughages were analysed. The results showed as follows：the crude protein （CP）, ether extract （ EE ）, digestible energy （ DE ）, metabolic energy （ME）, and net energy for growth （NEg） in vinegar residue were higher than those in other roughages, and the crude fiber （CF）,neutral detergent fiber （NDF） and acid detergent fiber （ADF） contents were the lowest. The ruminal degradability of roughages increased with the increase of retention time in rumen and had a trend to be stable finally. The C P effective degradability of roughages had a trend as vinegar residue 〉 blighted grain 〉 corn straw 〉 yam vine, while the effective degradability relative feed the last. of DM, OM, NDF and ADF showed as vinegar residue 〉 blighted grain 〉 yam vine 〉 corn straw. In conclusion, the value of vinegar residue for sheep was the highest , blighted grain was the second,yam vine and corn straw were the last.