拔节期弱光胁迫对扬麦15麦秸营养成分和体外发酵的影响  

Effects of Shading in Filling Stage on Nutrient Composition and in Vitro Fermentation of Yangmai 15 Wheat Straw

作　　者：何香玉[1] 李袁飞[1] 成艳芬[1] 朱伟云[1] 

机构地区：[1]南京农业大学动物科技学院消化道微生物实验室,南京210095

出　　处：《动物营养学报》2015年第10期3163-3169,共7页CHINESE JOURNAL OF ANIMAL NUTRITION

基　　金：公益性行业(农业)科研专项(200903003)

摘　　要：本试验旨在研究拔节期弱光胁迫对扬麦15麦秸营养成分和体外发酵的影响。试验以弱筋小麦扬麦15为材料,在拔节期进行3个遮阴水平(0、50%、66%)和3个遮阴时间(2、4、8 d)的处理,小麦成熟收割时取麦秸进行营养成分分析并评定其体外降解率。结果表明:1)与0组相比,遮阴50%组和66%组显著降低了麦秸粗蛋白质含量(P<0.05),遮阴时间以及遮阴水平与遮阴时间交互作用对麦秸营养成分的影响均不显著(P>0.05)。2)与0组相比,遮阴50%组和66%组显著降低麦秸干物质和中性洗涤纤维体外降解率(P<0.05),遮阴时间以及遮阴水平与遮阴时间交互作用对营养物质体外降解率的影响均不显著(P>0.05)。遮阴水平与遮阴时间的增加均降低了麦秸体外发酵产气量。遮阴时间的增加显著降低了总挥发性脂肪酸的产量(P<0.05),遮阴水平与遮阴时间的增加均显著降低了乙酸产量(P<0.05),且影响有交互作用(P<0.05),但对丙酸、丁酸产量和乙酸/丙酸无显著影响(P>0.05)。结果提示,拔节期遮阴处理降低了麦秸粗蛋白质含量、干物质和中性洗涤纤维体外降解率、产气量、总挥发性脂肪酸与乙酸产量,但对乙酸/丙酸没有影响;遮阴效果随时间与水平增加而增加。This study was conducted to investigate the effects of shading in filling stage on nutrient composition and in vitro fermentation of Yangmai 15 wheat straw. Yangmai 15 wheat strawwas used as experimental material,and shading treatments were set as three shading levels（ 0,50 % and 66 %） and three shading time（ 2,4and 8 d）. The nutrient composition and in vitro disappearance rate of wheat strawwere measured after harvested. The results showed as follows： 1） compared with 0 group,crude protein content in shading groups of50 % and 66 % was significantly decreased（ P〈0. 05）. There were no significant effects of shading time and the interaction of level and time of shading on nutrient composition of wheat straw（ P〉0. 05）. 2） compared with 0 group,in vitro disappearance rates of dry matter and neutral detergent fiber in shading groups of 50 %and 66 % were significantly decreased（ P〈0. 05）. There were no significant effects of shading time and the interaction of level and time of shading on in vitro disappearance rates of nutrients of wheat straw（ P〉0. 05）.Gas production was decreased by treatments of level and time of shading. Total volatile fatty acid（ TVFA）yield was significantly decreased with the increase of shading time,acetate yield was significantly decreased with the increase of shading level and time（ P〈0. 05）,and there was significant interaction of shading level and time（ P〈0. 05）,however,propionate and butyrate yield,and acetate / propionate were not affected（ P〉0. 05）. In conclusion,with shading treatment,crude protein content,in vitro disappearance rates of dry matter and neutral detergent fiber,gas production,TVFA and acetate yield can be decreased,but acetate / propionate will not be affected; the effects enhanced with the increase of level and time of shading.

关 键 词：麦秸 遮阴 营养成分 体外发酵 降解率 

分 类 号：S816.5[农业科学—饲料科学]