期刊文献+
共找到4篇文章
< 1 >
每页显示 20 50 100
可乐后备猪的基础选育
1
作者 张宗庆 吴蕊汝 +2 位作者 吴萍 金深逊 夏先林 《中国畜禽种业》 2009年第12期59-60,共2页
本文探讨了可乐猪的本品种及品种资源的基础选育,旨在后备猪血缘更新和提高种猪繁殖力。本实验对可乐猪的胎次、断奶后备母猪、4月龄后备种猪、6月龄后备猪性能测定和配种前进行选育,得出后备猪类型、特征、生长情况状况,体型外貌及抗... 本文探讨了可乐猪的本品种及品种资源的基础选育,旨在后备猪血缘更新和提高种猪繁殖力。本实验对可乐猪的胎次、断奶后备母猪、4月龄后备种猪、6月龄后备猪性能测定和配种前进行选育,得出后备猪类型、特征、生长情况状况,体型外貌及抗逆性的选择是提高可乐猪质量与利用的有效选育措施。 展开更多
关键词 可乐猪 后备猪 基础选育 品种资源
下载PDF
我国超级稻选育途径探讨
2
作者 邓祚荣 肖继断 《中国农学通报》 CSCD 2002年第4期108-109,共2页
借鉴全国多种先进的稻株模式 ,采取基础选育攻早熟 ,母本扩库攻大穗 ,父本增源攻重穗 ,综合培管攻多穗的技术路线和措施。育成的超级杂交水稻全生育期为 12 0d ,每公顷 330万穗 ,每穗 2 0 0粒 ,结实率 80 % ,千粒重 2 4g ,每公顷产稻谷 ... 借鉴全国多种先进的稻株模式 ,采取基础选育攻早熟 ,母本扩库攻大穗 ,父本增源攻重穗 ,综合培管攻多穗的技术路线和措施。育成的超级杂交水稻全生育期为 12 0d ,每公顷 330万穗 ,每穗 2 0 0粒 ,结实率 80 % ,千粒重 2 4g ,每公顷产稻谷 12t以上。 展开更多
关键词 超级稻 选育途径 基础选育 扩库增源 综合培管 中国
下载PDF
The Success of Tomorrow Is Based on Actions of Today
3
作者 PenttinenMika Ville Johannes 《Sociology Study》 2015年第6期469-479,共11页
Success of the organization is only success so far without the appropriate competence. Therefore, the Finnish Defence Forces will also need professional and motivated individuals both now and in the future. The variab... Success of the organization is only success so far without the appropriate competence. Therefore, the Finnish Defence Forces will also need professional and motivated individuals both now and in the future. The variable, interdependent, and complex environment has set totally new requirements for future's officers1. The Finnish cadets' selection process plays a crucial role, because the Finnish Defence Forces educate and train all the officers by itself. By means of the student selection will be made decisions whose influences have long temporal dimension, The officers who graduate from the Finnish National Defence University will build up the tomorrow's Finnish Defense Forces. In this paper, it will address the quality and functionality of the Finnish Defence University's student selection processes as part of competence and knowledge management from the organization's point of view2. Because of overall changes of society and the security environment, the Finnish officers' education and training system (see Figure 1) has been modified frequently during the few recent years. Both the reforms of the degree programs of Military Science and the Finnish higher education culture's modifications have been tried to notice during the analysis. The paper is based on the author's doctoral thesis that is compiling at the moment. 展开更多
关键词 Student selections officers' education and training degrees of Military Science
下载PDF
Reinforcement's incidental effects on reproductive isolation between conspecifics 被引量:2
4
作者 Biology Department Daniel R. MATUTE 《Current Zoology》 SCIE CAS CSCD 2016年第2期135-143,共9页
Reinforcement--the process whereby maladaptive hybridization leads to the strengthening of prezygotic isolation between species--has a long history in the study of speciation. Because reinforcement affects traits invo... Reinforcement--the process whereby maladaptive hybridization leads to the strengthening of prezygotic isolation between species--has a long history in the study of speciation. Because reinforcement affects traits involved in mate choice and fertility, it can have indirect effects on reproductive isolation between populations within species. Here we review examples of these "cascading effects of reinforcement" (CER) and discuss different mechanisms through which they can arise. We discuss three factors that are predicted to influence the potential occurrence of CER: rates of gene flow among populations, the strength of selection acting on the traits involved in reinforcement, and the genetic basis of those traits. We suggest that CER is likely if (1) the rate of gene flow between conspecific populations is low; (2) divergent selection acts on phenotypes involved in reinforcement between sympatric and allopatric populations; and (3) the genetic response to reinforcement differs among conspecific populations subject to parallel reinforcing selection. Future work continuing to address gene flow, selection, and the genetic basis of the traits involved in the reinforcement will help develop a better understanding of reinforcement as a process driving the production of species diversity, both directly and incidentally. 展开更多
关键词 REINFORCEMENT SPECIATION reproductive character displacement
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部