孵化期间鸡胚、肝脏、卵黄及蛋白组成的变化及其相关关系   总被引：6，自引：1，他引：6  

李吕木  David Peebles 《畜牧兽医学报》2005,36(6):574-577

将1188枚种蛋随机码放在6个蛋盘内，同机人孵，每盘为1个试验重复。于人孵的第6、9、12、15、18和21天从各盘取出36个胚蛋用于测定蛋清葡萄糖的含量；胚质量及其水分、蛋白质和脂肪含量；肝脏质量、水分和脂肪含量；卵黄囊质量、卵黄脂类及其脂肪酸的含量。结果表明，随着孵化时间的增加，肝脏的脂肪含量不断增加，但胚胎的水分含量、蛋清的葡萄糖含量和卵黄囊质量则不断减少，脂肪在孵化的第12天含量最低，蛋白质在孵化的第6、12和15天含量较高。相对肝质量与胚胎的水分含量正相关，与孵化第15天的卵黄棕榈酸和油酸分别为正相关和负相关。卵黄硬脂酸含量与孵化第6天的亚油酸和孵化第12天的油酸均为负相关，但与孵化第6和15天的花生四烯酸均正相关。  相似文献   

怎样提高肉种鸡的均匀度     

苑彪 《养殖技术顾问》2006,(4):6-7

在鸡群体质良好的前提下，鸡群的生产性能与体重均匀度呈高度的正相关。体重均匀度决定了鸡群体成熟和性成熟的一致，对于饲养管理人员来说，提高均匀度是一项综合工作。笔者通过十几年的生产实践，总结出以下6项关键技术措施来提高鸡群的均匀度，从而达到提高生产性能的目的。  相似文献   

食品安全与居民幸福感的相关性分析     

杨凯  胡武贤 《安徽农学通报》2013,(18):133-136

幸福是人的一种主观心理感受。食品安全与居民幸福感呈正相关关系,且具有边际递增的特征。食品安全事件引起居民健康担忧,从而影响生活满意度,进而降低居民幸福感。当食品安全事件爆发后,乘数效应会放大这一过程,加速居民幸福感下降;蝴蝶效应会引起连锁反应,导致社会幸福感整体下降。该文阐述了我国食品安全的严峻形势、源自食品安全的幸福感以及食品安全影响居民幸福感的作用机理,并进行了案例内分析和跨案例分析。  相似文献   

Natural Variation of Leaf Thickness and Its Association to Yield Traits in indica Rice   总被引：2，自引：0，他引：2  

LIU  Chuan-guang ZHOU  Xin-qiao CHEN  Da-gang LI  Li-jun LI  Ju-chang CHEN  You-ding 《农业科学学报》2014,13(2):316-325

Leaf thickness is an important morphological trait in rice. Its association to the yield potential, as of now has not been documented because of the shortage of the equipment which could conveniently measure the leaf thickness in rice. In this study, the thickness of top three leaves of 208 cultivars had been determined by a nondestructive rice leaf thickness instrument for the research of the natural variation of leaves thickness and its association to yield traits in indica rice. The results showed that the flag leaf was the thickest, and the 2nd leaf was thicker than the 3rd leaf. Analysis of variance indicated the existence of wide genetic diversity of leaf thickness among the investigated indica rice genotypes. The tight correlation among the thicknesses of the top three leaves means that the leaf thickness traits share one genetic control system. Leaf thickness had a significant positive correlation with leaf length and a positive correlation with leaf width, indicated that thicker leaf was beneficial to increasing the single leaf area. The results of correlation analysis revealed that thicker leaf should be profitable to the leaf erection, higher numbers of grains per panicle and higher grains weight per panicle. However, the significantly negative correlation between leaf thickness and number of panicles per plant counteracted the profitability from increased grains weight per panicle, so that the correlations of the thicknesses of the top three leaves to yield and biomass were positive but not significantly. It has made great progress in the genetic improvement of leaves thickness in inbred indica rice breeding in Guangdong Province, China, since the 1990s.  相似文献   

甜瓜种子生活力和发芽率的相关性比较   总被引：1，自引：0，他引：1  

游秀枫 《福建农业科技》2005,(1):20-21

采用四唑法和标准法分别测定甜瓜种子(非休眼状态)的生活力和发芽率，结果表明，甜瓜种子生活力和发芽率之间具有极显的正相关(r=0．9234^**)。经过试验和统计分析还显示。甜瓜种子的生活力和发芽率的结果相一致，即四唑测定甜瓜种子生活力的结果可代表其发芽率(种子在适宜条件下，发芽并长成幼苗的能力)的结果。  相似文献   

同源四倍体水稻结实率定向选择的遗传效应          下载免费PDF全文

李亚娟  房三虎  卢永根  李金泉  刘向东 《华南农业大学学报》2007,28(4):30-33

以结实率正常的同源四倍体水稻杂交组合广陆矮4号-4x×L202-4x为材料,连续5代进行定向选择,调查结实率和几个主要农艺性状,分析定向选择对同源四倍体水稻结实率的遗传效应及结实率与农艺性状间的相关关系.在人工选择压力下,结实率的群体平均值逐代增大,高结实率单株的频率逐代增加,且上下代结实率呈显著水平的正相关关系.在定向选择过程中,随着结实率的提高,穗数、剑叶长、剑叶宽和穗颈抽出长有较小幅度的增加,但每穗粒数显著降低.  相似文献