饲粮锌对蛋鸡生产性能及生殖激素的影响

试验选用66只18周龄商品代伊莎褐育成母鸡。随机分为3组,每组22只,对照组饲喂基础饲粮,试验1、2组在基础饲粮中分别添加601、80 mg/kg的锌,研究不同锌添加水平对蛋鸡生产性能和血清中生殖激素的影响。结果表明,在蛋鸡饲粮中添加锌对产蛋量、耗料量和料蛋比无显著影响（P〉0.05）,但破蛋率略下降,蛋重显著降低（P〈0.05）;试验1组血清中E2含量显著高于对照组（P〈0.05）,与试验2组无显著差异（P〉0.05）;试验2组与对照组亦无明显差异（P〉0.05）;而血清中P4含量3组间无显著差异（P〉0.05）。     

陕西关中地区人工饲养6～10龄非洲鸵鸟产蛋规律研究

对饲养于陕西关中地区的49只6-10龄非洲鸵鸟产蛋规律进行了研究．结果表明,6-10 龄鸵鸟每年平均产蛋数分别为56．24±27．79、48．32±24．19、52．84±25．50、35．32±16．46、45．08 ±19．51枚,其变异系数分别为49．05％、50．07％、48．26％、46．62％、43．27％．5年来每只鸵鸟每年平均产蛋(47．56±8．06)枚,变异系数为16．94％．随着年龄增长,全年平均产蛋数呈现为:6龄、8 龄和10龄产蛋数高,7龄和9龄产蛋数略有下降,且9龄、10龄产蛋数明显低于6-10龄平均产蛋数,这种年龄间产蛋数差异不显著(P>0．05)．在9、10龄鸵鸟产蛋数随着年龄增长下降趋势,这种趋势现在也不是很明显．全年中,从2月份开始产蛋数量逐渐增加,6月份达到产蛋高峰,然后产蛋量开始下降,10月份达到全年最低,以后产蛋数略有上升,11月份达到次高峰,2月份又降低,但没有低于10月份产蛋数．同样饲养条件下,比较在正常气候和干热、多雨、寒冷等气候条件下鸵鸟产蛋数量变化幅度,得出干热、多雨、寒冷等气候条件对于鸵鸟产蛋均有很大影响,且多雨影响作用最大,寒冷、干热等气候条件影响作用依次减小．     

东山矿采空区埋管法治理上隅角瓦斯

分析了采煤工作面的瓦斯来源及上隅角瓦斯积聚的原因,论述了采空区埋管法治理上隅角瓦斯的原理及实践应用。     

高层建筑设计中箱基的埋深和沉降差异探讨

结合工程实践 ,从设计的角度对高层建筑箱基的埋置深度和主楼与裙房间沉降差异的解决措施进行了讨论 ,提出了一些处理实际工程问题的措施 .     

经编多轴向技术及其在复合材料中的应用

介绍了经编多轴向衬纬技术发展状况,分析了经编多轴向辅层织物作为高性能复合材料增强结构在物理机械性能和经济性方面的优势和巨大的市场潜力     

二氢吡啶对蛋鸡产蛋性能的影响

取３００日龄罗曼蛋鸡１５３６只,随机分为４组（每组设４个重复）,在自由采食,饮水和光照１６ｈ的条件下,分别饲喂添加０ｍｇ／ｋｇ,１０ｍｇ／ｋｇ,１５０ｍｇ／ｋｇ,２００ｍｇ／ｋｇ二氢吡啶 的玉米,豆煌局粮９０ｄ。结果表明：含１５０ｍｇ／ｋｇ,２００ｍｇ／ｋｇ二氢吡啶饲粮,可使日均产蛋率分别提高７．５２％（Ｐ〈０．０１和７．９３％（Ｐ〈０．０１）,料蛋比分别降低５．８１％（Ｐ〈０．０５）和６．２２％     

Pre-ovipositional and ovipositional behaviour of Lasioseius ometes (Oudemans) and Hypoaspis kargi Costa (Acari: Dermanyssiae: Ascidae,Laelapidae) with notes on egg protection strategies in Mesostigmata

Egg deposition by the soil mites Lasioseius ometes (Oudemans, 1903) and Hypoaspis kargi Costa, 1968 was observed using continuous video-monitoring. The process in both species was found to consist of four distinct phases. In Phase 1, both species engage in pre-ovipositional activity prior to the egg being extruded from the genital opening. In L. ometes, the female often selects a substrate depression for egg laying and examines the depression carefully with the gnathosoma and legs I before oviposition. In H. kargi, egg deposition sites are chosen without regard for substrate depressions. Phase 1 lasted approximately 3 minutes for both species. Phase 2 involved egg extrusion and holding of the egg beneath the gnathosoma. Phase 2 lasted approximately 20 times longer in L. ometes (5 minutes) than in H. kargi. Alteration of the egg surface in the form of thorn-like outgrowths was recorded in L. ometes. Egg deposition occurs in Phase 3, and in L. ometes the egg is generally placed at the deposition site using the chelicerae. Hypoaspis kargi also uses the chelicerae for egg manipulation, but also adjusts orientation of the egg with legs I. The sticky nature of egg surface in H. kargi may provide a means for the female to effectively cover the exposed egg with a protective layer of soil particles. Egg deposition in both species occurred in less than 90 seconds. Phase 4 involves egg covering, but behaviour of the female during this last phase differs markedly between the two species. In L. ometes, the female tends to remain close to the egg, whereas in H. kargi the female moves away from the egg to search for substrate particles appropriate for its covering. The average time for Phase 4 in H. kargi was approximately four times longer (80+ minutes) than in L. ometes.     

柴油机共轨蓄压式燃油喷射系统输油管道的建模分析

文章采用FLOWMASTER2软件,将柴油机共轨蓄压式燃油喷射系统输油管道分为几个子系统进行仿真和建模,然后将它们集成在一起,分析输油管道参数对系统的影响;结果证明,该方法改善了燃油喷射性能,为蓄压共轨喷油系统的设计以及参数优化提供了理论依据。     

通信电缆敷设质量控制探讨

在通信电缆工程中,电缆铺设是重点管理项目,对工程的进程及工程质量有重大影响。文章从路径的选择、铺设前准备工作、技术措施、施工方法、工程试验和交接等方面对通信电缆的铺设工作进行详细阐述,说明其质量管理的重要性。     

10kV电力电缆敷设安装探讨

笔者主要阐述了10 kV电力电缆在施工前的检查工作、电缆的敷设方式、电缆敷设时注意事项等方面,保证了电缆线路的施工质量,促进电缆线路施工技术水平的提高,确保电缆线路安全运行。