安定和鹿安宁对应激梅花鹿某些血液指标的影响

将 30头试验鹿随机分为 3组 ,Ⅰ组为对照组 ,Ⅱ、Ⅲ组为试验组 ,分别在日粮中添加 5 0mg/kg安定和 10 0IU/kg鹿安宁。观测保定—锯茸应激状态下 ,梅花鹿血液白细胞的数量和组成、血浆总糖皮质激素、皮质醇浓度及淋巴细胞糖皮质激素受体含量的变化。结果表明 ,安定和鹿安宁均可显著提高应激鹿血液白细胞总数 (P <0 0 1) ,鹿安宁可使之趋于正常 (P >0 0 5 ) ;安定和鹿安宁均可显著提高应激鹿血液中淋巴细胞百分率 (P <0 0 1) ,降低N/L值 (P <0 0 1)。安定和鹿安宁可显著降低应激鹿血浆总糖皮质激素、皮质醇浓度 ,提高应激鹿血液淋巴细胞糖皮质激素受体含量 (P <0 0 1)。综合比较 ,鹿安宁的作用效果较安定好     

迪卡配套系猪RYR1的PCR分析及其利用的研究

试验从鸡东县永安猪场随机抽取迪卡配套系猪B系和E系42头，通过PCR扩增技术和酶切鉴定．采用克隆技术进行测序，来检测是否含有氟烷基因序列。经过以上技术检测这42头猪均没有氟烷基因。     

热应激对动物生殖机能的影响及其作用机理

温度对动物生殖机能具有重要的影响,本文分别阐述热应激对雌性动物发情、受胎率、胚胎成活率、产仔数以及对雄性动物繁殖性能的影响,并提出了热应激对动物生殖机能影响的可能作用机理。     

宰前运输对肥育猪胴体、内脏及肉质的影响

本试验对 1 0头宰前运输应激的大长淮 (大白×长白×淮猪 )肥育猪 (试验组 )和5头宰前无应激的大长淮肥育猪 (对照组 )作了胴体、内脏及肉质测定。试验组与对照组在胴体性状和内脏重量 (心脏除外 )方面无显著差异。应激组和对照组的肌肉 p Hu和肉色评分分别为 5.50 ,2 .2 5和 5.88,3 .0 0 ,差异显著 (P<0 .0 1 )。试验组肉质有下降趋势。     

钢管混凝土拱桥的施工监控技术

钢管混凝土是由混凝土填入薄壁钢管而形成的一种组合材料。在桥梁结构上,钢管混凝土主要应用于拱桥。目前,大跨度钢管混凝土拱桥主要采用缆索吊装-斜拉扣定施工新技术,拱桥的线形通过实测每节钢管拱的标高及拱轴线位置,并借助扣索实施动态调整来保证。为此,介绍了钢管混凝土拱桥施工过程的监控技术,从而指导施工,以确保拱桥建成后满足设计要求。     

变截面构件的剪应力计算

变截面构件的弯曲变形是实际构件常见变形之一，现行钢筋混凝土设计规范提供的和实际设计计算应用的剪应力计算公式未考虑截面变化的影响，有较大的误差。本文用材料力学方法推出考虑变截面影响的剪应力计算公式，以便在实际设计计算应用。     

棉铃疫病在阿拉尔的发生

棉铃疫病是长绒棉铃期的重要病害,在新疆阿拉尔地区,七月底至八月上旬,若遇低温、阴雨、高湿的环境条件也能严重流行。种植抗病品种和改善生态因素是控制病害发生和流行的重要途径。     

低温热水地板供暖系统简述

本文介绍了低温热水地板供暖系统的特点。对设计中存在的几个问题进行分析:热负荷计算问题、户内系统阻力损失和地板加热盘管敷设形式及间距选择问题。     

NaCl胁迫对4种豆科牧草萌发的影响

为研究盐渍化对4种牧草种子盐胁迫下发芽成苗的影响,探索不同牧草种子盐胁迫下的萌发表现,试验借鉴农作物研究的理论和方法,并在实验室条件下用不同浓度的NaCl溶液对种子进行处理,并观察其萌发特性,以期为生产实践提供有用的依据,减少在生产中的损失,提高草业生产的经济效益。1     

Epidemiology of beet necrotic yellow vein virus in sugar beet at different initial inoculum levels in the presence or absence of irrigation

A field experiment was set up in 1988 to study the development of rhizomania disease of sugar beet at different inoculum levels of beet necrotic yellow vein virus (BNYVV) in soil. Five, tenfold different, inoculum levels were created by addition of the approximate amounts of 0, 0.5, 5, 50 and 500 kg infested soil per ha (the latter corresponding to 0.01% v/v calculated to the tillage layer). A drip irrigation treatment was applied to study the influence of soil moisture on disease. Susceptible sugar beet, cv. Regina, was grown for three consecutive years.In the first year, root symptoms were not observed, but BNYVV-infected plants were detected by ELISA in low numbers at all inoculum levels at harvest. After late drilling in 1989, high numbers of infected plants, up to 90–100% in plots with the highest inoculum level, were detected already in June. Root symptoms were also observed from June onwards. In both these years disease incidence increased in time and was significantly influenced by the initial inoculum level. In the third year, the whole field was heavily diseased, and only for the non-irrigated plots incidence differed for different initial inoculum levels. The expression of symptoms by BNYVV-infected plants was influenced by initial inoculum level, thus by the amount and timing of primary infection.Root weight at harvest was not affected, but sugar content decreased with increasing inoculum level already in 1988, leading to a reduction in sugar yield of 10% at the highest inoculum level. In 1989, both root weight and sugar content decreased progressively with increasing inoculum level, resulting in sugar yield reductions of 11–66% (down to approximately 3000 kg ha^–1) for low to high inoculum levels compared to the control. As the control plots became contaminated, all yields were low in 1990, still showing a decrease with increasing inoculum level in the non-irrigated plots, but an overall mean sugar yield of 3323 kg ha^–1 for the irrigated ones.Sodium and -amino nitrogen content of the root, additional quality parameters determining extractability of sucrose, showed an increase and decrease, respectively, with increasing initial inoculum level already in the first year. The relative differences in contents compared to those from the control were largest for Na content. A significant negative correlation was found between Na (mmol kg^–1 root) and sugar content (% of fresh weight); linear for 1988, exponential for 1989 and 1990.In spring 1989, the infestation of individual plots was assessed using a quantitative bioassay estimating most probable numbers (MPNs) of infective units of BNYVV per 100 g dry soil. The relationship between the MPns determined and root weight, sugar content and sugar yield at harvest could be described by Gompertz curves. The increase in disease incidence with increasing MPN in 1989 was adequately fitted with a logistic equation.