北航数字电路面试试求rp为51欧v1，v0的值

来源：蜘蛛抓取(WebSpider) 时间：2017-10-31 09:43 标签： 数字电路笔试
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不同生育期芦竹的营养价值及体外产气特征
本试验旨在探究不同生育期芦竹的营养价值及体外产气特征.采用常规分析法测定生育期分别为75、90、105、120、135 d的整株芦竹、芦竹茎、芦竹叶的营养成分含量;用体外产气法测定芦竹体外发酵72 h的发酵液pH、干物质消失率(DMD)、中性洗涤纤维消失率(NDFD)和酸性洗涤纤维消失率(ADFD)以及产气量(GP)和产气动态参数.结果表明:1)随着生育期的推移,整株芦竹的粗蛋白质含量逐渐降低,中性洗涤纤维(NDF)、酸性洗涤纤维(ADF)及酸性洗涤木质素(ADL)含量呈升-降-升的波浪状变动,但总体呈上升趋势;茎、叶中的营养成分含量波动较大.2)随生育期的推移,DMD、NDFD和ADFD逐渐降低,75 d与90 d差异不显著(P&0.05),这2者显著或极显著高于105、120 d(P&0.05或P&0.01).3)随着生育期的推移,最大GP呈现递减趋势,其中75 d与90 d无显著差异(P&0.05),二者均显著或极显著低于其他生育期(P&0.05或P&0.01),其中105、120和135 d的最大GP分别比90 d低了40.22%、50.98%和51.53%;产气速度呈现相似的变化趋势.综合得出,芦竹做为牧草的最佳生育期为90 d.
Abstract：
This study was conducted to explore nutrition values and in vitro gas production characteristics of Arundo donax in different growth periods.Whole plant,leave and stem of Arundo donax in different growth periods (75,90,105,120 and 135 d) were determine for nutrient contents by conventiofermentation fluid pH,dry matter disappearance rate (DMD),neutral detergent fiber disappearance rate (NDFD) and acid detergent fiber disappearance rate (ADFD),as well as gas production (GP) and GP dynamic parameters of Arundo donax were determined after fermented for 72 h by an in vitro GP method.The results showed as follows: 1) with the extension of growth period,in whole plant of Arundo donax,crude protein content was gradually decreased,and neutral detergent fiber (NDF),acid detergent fiber (ADF) and acid detergent lignin (ADL) contents showed up-down-up of wave shape changes,bunutrient contents in leave and stem were in great change.2) With the extension of growth period,DMD,NDFD and ADFD were decreased,there were no significant differences between 75 and 90 d (P&0.05),and the two periods were significantly higher than 105 and 120 d (P&0.05 or P&0.01).3) With the extension of growth period,maximum GP showed decreasing tendency,there was no significant difference between 75 and 90 d (P&0.05),and the two periods were significantly lower than the other periods (P&0.05 or P&0.01),and 105,120 and 135 d were 40.22%,50.98% and 51.53% lower than 90 d,GP rate showed similar tendency.In conclusion,Arundo donax using as a forage grass should be cut before 90 d.
OUYANG Fulong
PENG Yuanyuan
XIAO Liang
HE Jianhua
作者单位：
湖南农业大学动物科技学院,长沙,410128
湖南农业大学农学院,长沙,410128
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