中国粮食进口安全综合评价研究——基于超效率DEA模型     

王瑞峰  李爽  姜宇博 《浙江农业学报》2018,30(3):489

在对粮食及粮食进口安全内涵加以界定的基础上,从粮食数量、粮食质量、粮食价格、粮食贸易、国家经济、生态环境6个方面分析中国粮食进口安全的影响因素,基于超效率DEA模型构建中国粮食进口安全评价模型。对1992—2015年中国粮食进口安全状况进行评价,结果表明,1992—2015年中国粮食进口处于安全状态,粮食进口对我国粮食价格安全和生态安全的影响程度较小,对数量安全、质量安全、贸易安全和经济安全的影响程度较大。  相似文献   

Effect of chlorogenic acid on intestinal inflammation,antioxidant status,and microbial community of young hens challenged with acute heat stress     

Fang Chen  Hao Zhang  Na Zhao  Xuehai Yang  Encun Du  Shaowen Huang  Wanzheng Guo  Wei Zhang  Jintao Wei 《Animal Science Journal》2021,92(1):e13619

Heat stress in poultry is deleterious to productive performance. Chlorogenic acid (CGA) exerts antibacterial, anti-inflammatory, and antioxidant properties. This study was conducted to evaluate the effects of dietary supplemental CGA on the intestinal health and cecal microbiota composition of young hens challenged with acute heat stress. 100-day-old Hy-line brown pullets were randomly divided into four groups. The control group (C) and heat stress group (HS) received a basal diet. HS + CGA₃₀₀ group and HS + CGA₆₀₀ group received a basal diet supplemented with 300- and 600-mg/kg CGA, respectively, for 2 weeks before heat stress exposure. Pullets of HS, HS + CGA₃₀₀, and HS + CGA₆₀₀ group were exposed to 38°C for 4 h while the control group was maintained at 25°C. In this study, dietary CGA supplementation had effect on mitigate the decreased T-AOC and T-SOD activities and the increasing of IL-1β and TNFα induced by acute heat stress. Dietary supplementation with 600 mg/kg CGA had better effect on increasing the relative abundance of beneficial bacterial genera, such as Rikenellaceae RC9_gut_group, Ruminococcaceae UCG-005, and Christensenellaceae R-7_group, and deceasing bacteria genera involved in inflammation, such as Sutterella species. Therefore, CGA can ameliorate acute heat stress damage through suppressing inflammation and improved antioxidant capacity and cecal microbiota composition.  相似文献   

体细胞克隆荷斯坦奶牛出生后死亡犊牛内脏器官的组织病理学观察     

孙伟  包向男  乌云高娃  王建国  李永胜  李善铎  张铁柱  王飞飞  李喜和 《中国农学通报》2020,36(20):114-118

为探究体细胞克隆荷斯坦奶牛出生后死亡的原因,对新生后死亡的克隆荷斯坦公牛和自然繁殖的荷斯坦公犊的主要组织器官进行比较。通过解剖和石蜡切片-HE(hematoxylin-eosin staining)染色技术,对主要的组织器官结构进行观察和分析。结果表明,新生后死亡的克隆荷斯坦公牛肺部结构清晰;肝脏的肝细胞明显肿大,出现脂肪轻度变性;肾小管上皮细胞出现变性;心肌的肌纤维间空隙增大;骨骼肌纤维间隙明显,空泡变性,这可能导致该克隆牛犊肌肉无力并功能不全;淋巴结皮髓质界限不分明,淋巴小结细胞较稀疏,生发中心不明显,淋巴窦细胞较少;脾脏内红细胞较少,这说明该克隆牛的造血功能可能不完善;胸腺的皮质部分和髓质部分界限不明显,嗜酸性胸腺小体不易辨认,可能发育不全。该克隆公牛免疫器官出现不同程度的发育不全现象较严重,这有可能是其出生后死亡率高的主要原因。  相似文献   

水霉属菌(Saprolegnia)分离培养技术研究   总被引：1，自引：0，他引：1  

文冰  郑耘 《植物病理学报》1996,26(3):277-281

 对水霉(Saprolegnia)的分离培养技术进行了探索,筛选出大麻籽、油菜籽、红花籽、苍蝇、蚜虫、小麦粒、玉米片、茶叶、葵花仁9种材料作为诱发水霉菌的诱饵。其中油菜籽能防止腐霉菌(Pythium)污染,是初步纯化菌种、排除杂菌的适宜饵料。同时发现控制温度能使水霉在最短时间内分别产生无性或有性繁殖。在水培条件下,25℃左右适合菌丝及无性器官的发育,有性器官却不能产生,而只有在15~17℃条件下才能使水霉很快进入有性生殖阶段;在加入200mg/L链霉素的CMA培养基上促发有性阶段则需要在25℃左右的温度下进行,方能缩短培养时间。  相似文献   

降低肉鸭皮脂的可行性探讨     

蒋立  王继文 《四川畜牧兽医》2001,28(12):25-26

肉鸭皮脂作为一个数量性状进行选择是有效的、可行的，本文从营养、饲养管理、遗传各因素与皮脂的关系探讨降低皮脂的可行性。  相似文献   

Studies on Tomato Seedling Quality Indices Under Simulated Shipping and Storage Conditions     

NING Wei  GE Xiao-guang  LI Tian-lai 《中国农业科学(英文版)》2004,3(12)

Indices of the tomato seedling quality maintenance level after production before field planting were studied through simulated experiments, small--scale operation, indoor analyses and measurements, and field observation. The results showed that under simulated shipping and storage conditions, seedling quality change following different durations (days) of shipping and storage was correlated significantly or even very significantly with certain physiological and morphological indices. With various measured indices following different periods of shipping and storage treatment subjected to multinomial successive regressive correlation analysis, the principal factors influencing seedling quality maintenance level are identified to be chlorophyll content→dry short weight→ leaf freshness index in order of their importance. Significance analysis with multinomial fitted equation indicated that correlations between any one of above three factors and the growth index after field planting reached very significant difference level.  相似文献   

信鸽新城疫并发大肠杆菌病的诊治     

卫永生陈岱辉  姬军峰蒋沛源 《中国动物检疫》2004,21(2):40-40

鸽新城疫又称鸽瘟或鸽Ⅰ型副粘病毒病 ,是由鸽Ⅰ型副粘病毒引起的一种高度接触性、败血型传染病。主要表现为腹泻、神经紊乱、呼吸困难及浆膜、粘膜出血等 ;鸽大肠杆菌病是由大肠埃希氏杆菌感染所引起的局部或全身性感染的疾病。若新城疫和大肠杆菌并发 ,将给养鸽爱好者以很大的经济损失和精神打击。现将本人在临床上遇到的两起病例介绍给大家 ,以供参考。1发病情况2003年5月初 ,平顶山市郊西信鸽爱好者相继到我中心 ,叙述了其200多只信鸽参赛后大群出现拉稀、精神不振 ,个别眼流泪 ,有神经症状 ,用氟哌酸、阿莫西林、痢特灵、氯霉素治疗 ,…  相似文献   

猫鼻气管炎病毒、怀状病毒、泛白细胞减少症病毒的分离及其其形态学观察     

李六金  李成  姜焕宏  吴钟灵  胡淑贤  师长宏  张志培  李学忠  刘晓荣 《中国预防兽医学报》2001,23(5):341-345

根据病毒的理化特性，从猫三联活疫苗中分离出猫鼻气管炎、猫西洋太和猫泛白细胞减少症病毒；筛选出每种病毒敏感的细胞，并将该3种病毒分别分别在其中传代与扩增；通过电镜观察此3种病毒的形态学特征及其在宿主细胞内增殖部位、分布情况等，并以此对猫3种病毒进行了初步鉴定。  相似文献   

辣椒夏季品比试验报告     

杨朝进  陈炳金  魏智勇 《辣椒杂志》2004,2(1):14-16

为了考察我公司新推广品种及新配组合在高温伏旱状况下的适应性，我们于2003年5月7日在公司试验基地进行了品种对比试验。结果表明新推广品种中有九个品种或组合为极耐热或耐热，一个品种耐热性稍差。新配组合中部分表现优良，有推广前景。  相似文献   

Model of the myocardial infarction in the Beagle dogs by intracoronary embolization with the polyethylene foam     

JIN hong-feng  SHEN fa-rong  LIN feng  HUANG Shu-wei  YU Wei  Xia Yu  CHEN Jian-min  WANG Zhi-jun 《园艺学报》2009,25(8):1660-1661

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