复合化学处理对麦秸干物质和纤维瘤胃降解率的影响

为了研究复合化学处理对麦秸干物质和纤维瘤胃降解率的影响,本试验将尿素和氢氧化钙均按麦秸风干重2%,3%和4%的量分别添加,共9个试验组,各试验组尿素和氢氧化钙的添加量依次为1组2%+2%,2组2%+3%,3组2%+4%,4组3%+2%,5组3%+3%,6组3%+4%,7组4%+2%,8组4%+3%和9组4%+4%,对照组为原麦秸,通过短期人工瘤胃技术测定不同复合处理麦秸干物质和纤维的瘤胃72 h降解率。结果表明:7组,8组和9组三个组的干物质和酸性洗涤纤维瘤胃72 h降解率极显著高于对照组和其他试验组(P<0.01);干物质和酸性洗涤纤维瘤胃72 h降解率分别比对照组提高90.96%,85.24%,75.03%和139.38%,132.06%,130.94%;7组和8组两个组的中性洗涤纤维瘤胃72 h降解率极显著高于对照组和1～6组(P<0.01),显著高于9组(P<0.05),中性洗涤纤维瘤胃72 h降解率比对照组提高92.06%和82.51%。在本试验设计条件下,用占秸秆风干重4%的尿素+2%的氢氧化钙共同处理是最适宜的麦秸复合化学处理法。

Effects of compound chemical treatment on dry matter and fiber degradation rate of wheat straw in rumen

To investigate effects of compound chemical treatment on dry matter(DM) and fiber degradation rate of wheat straw in rumen,urea and calcium hydroxide were added on the basis of straw air-dried matter with 2%,3% and 4% respectively,a total of nine experimental groups,urea and calcium hydroxide added in group1 to group9 in turn were: 2%+2%,2%+3%,2%+4%,3%+2%,3%+3%,3%+4%,4%+2%,4%+3% and 4%+4%,the control(CK) group was the original wheat straw,DM and fiber degradation rate after 72 hours of different treatments for straw were measured by short-term artificial rumen technique.The results showed that: group 7,8 and 9 were significantly higher than CK group and other experimental groups(P<0.01) in DM and acid detergent fiber(ADF) degradation rate after 72 hours,which increased by 90.96 %,85.24%,75.03% than CK group in DM degradation rate and 139.38 %,132.06 %,130.94 % in ADF degradation rate respectively.There was no significant differences(P>0.05) among group 7,8 and 9.Group 7 and 8 were significantly higher than CK group and other six experimental groups(P<0.01) in neutral detergent fiber(NDF) degradation rate after 72 hours,which was increased by 92.06%,82.51% respectively,and significantly higher than that of group 9(P<0.05).Under this experimental condition,the treatment added with 4% urea and 2% calcium hydroxide of wheat straw air-dried matter was the most suitable compound chemical treatment.