如何应对猪价低谷?

1.重视市场信息收集,搞好市场预测,根据猪价小范围上下波动的规律,适时出栏合适体重的育肥猪,尽量卖一个相对好的价钱.     

母奶牛繁殖障碍的原因及诊治(上)

一、母牛生殖器官疾病 1.慢性子宫炎. 病因:多由急性转变而来.大多由大肠杆菌、链球菌、葡萄球菌等引起.配种用具污染、分娩时消毒不严、助产不当、产后子宫复旧不全、胎衣停滞、牛布氏杆菌病等均可引发子宫内膜炎.     

奶牛繁殖中的几个问题

奶牛的发展很大程度上取决于牛的繁殖,繁殖力就是奶牛的生产力,如果奶牛不能有效的繁殖,也就失去了饲养价值,而被淘汰。奶牛因不孕症淘汰占母牛淘汰率的比例达32％,因此,搞好奶牛的繁殖对增加奶牛头数,产奶量的提高和获得好的经济效益至关重要。目前在石河子垦区,规模化大牛场,出现头胎母牛产后90—120天不发情,有些是久配不孕,还有些配种后2—3上个情期又返情等,     

论现代管理方法对成本核算的影响

现代制造方法的发展催生和促进了现代管理方法的发展,现代管理方法对成本核算和控制提出了更高的要求。通过适时制、全面质量管理、战略管理三种管理方法对传统成本法的影响分析,论述了现代管理方法对成本核算的影响。     

Primary investigation on GISH-NOR in cotton

Six loci of nucleolar organizer region (NOR) were detected in genomic in situ hybridization (GISH) of cotton (Gossypium). NOR was the characteristic of 45S rDNA but could be generated by genomic DNA (gDNA) extracted from Gossypium species as probe. With twice FISH to the same mitotic cell of G herbaceum or G hirsutum, number, position and size for NORs generated from 45S rDNA and gDNA were identified largely similar or even the same. The NORs with gDNA as probe were therefore permanently defined as GISH-NORs. GISH-NORs from G hirsutum and Graimondii mitotic images were all terminal types. Four and two GISH-NORs from G herbaceum (var. africanum) were terminal and centromere types, respectively. Six GISH-NORs in G hirsutum were chromosome mapped with two in A- and four in D-subgenomes. There were also GISH-NORs in mitotic image of G raimondii with its own gDNA as probe. From mitotic image of G herbaceum with its own gDNA as probe, GISH-NOR could not be observed but non-wholerecovery of hybridized signals was distinguished. These non-whole-recovery of hybridized signals were detected on long arm terminals of most chromosomes and especially existed in nearly half long arm of a pair of chromosomes in Gherbaceum gDNA probed itself GISH image, which may be possibly induced by low copy genes within the regions rather than inter-subgenomic segment translocations. GISH-NORs in G hirsutum mitotic images were dominantly observed when gDNAs from D and A genome species were used as probes and block, respectively, but not when the reverse probe and block gDNA from the two diploid progenitor genomes were designed. There may be two speculations to this special phenomenon: rDNA concerted evolution; content of rDNA in genome D more than genome A.     

寻找适合孩子的教育——探索性主题教育活动的开发与操作

幼儿园主题活动是幼儿围绕着一个主题,自主观察、探索周围现象和事物、自由表达表现,教师适时适度地予以支持和引导的系列活动。它是一种低结构、高开放、重过程的幼儿自主活动,以求真正意义上寻找适合孩子的教育。幼儿园的一些活动中存在着"三多三少"的现象。教师预设的活动比较多,幼儿生成的活动比较少;教师干涉的比较多,幼儿自主地探索的比较少;规定的表达方式比较多;自我表达相对比较少。突破幼儿课程改革的关键问题,探索预设与生成之间的的关系,关注孩子的自身     

沙颍河安徽段航道整治工程碍航桥梁分期适时改造的可行性分析

通过对沙颍河安徽段航道跨河桥梁通航净空尺度的统计,重点分析了跨河桥梁的多年平均碍航天数,结合河道特性、运量预测、建设资金合理利用等情况,论述了碍航桥梁分期适时改造的可行性.     

影响家畜繁殖力的主要因素

简述了家畜繁殖力的含义，探讨了影响家畜繁殖力的主要因素。     

提高母羊繁殖力的五种方法

母羔的初情期在75—90日龄。初配期可安排在5．7月龄、体重达到20公斤时。1年两胎，应安排在春、秋两季配种繁殖，两年3胎的通常每8个月为1个繁殖周期，其中妊娠期5个月，哺乳期两个月，配种期1个月。或按1年产单胎、1年产双胎的办法安排。对发情母羊要适时配种。若自然交配，1只2—6岁的公羊可以负担20-30只繁殖母羊，若进行人工辅助交配，