【摘 要】
：
We initiated a selective breeding program to improve the growth rate of manila clam since 2007,and a full-sib family with orange shell color was selected.Th
【机 构】
：
Engineering Research Center for Shellfish Culture and Breeding of Liaoning Province,College of Fishe
【出 处】
：
“全球变化下的海洋与湖沼生态安全”学术交流会
论文部分内容阅读
We initiated a selective breeding program to improve the growth rate of manila clam since 2007,and a full-sib family with orange shell color was selected.This family features high survival but slow growth.Thereafter,two generations of mass selection were conducted in this family by 10%upward selection for faster growth.In 2011,three types of lines were produced by selecting the breeder from second-generation selected line.They are SS(subject to three generations of selection for growth in shell length),SC(selected for the second but not the third generation),and C(randomly sampled individuals from national population).The results show that the shell length of the SS line was significantly larger than these of the SC and C lines at any stages(P<0.05).The genetic parameters of the shell length were,respectively,hR2(realized heritability): 0.42,SR(response to selection): 0.73,GG(genetic gain): 6.66 for larval stage;hR2:0.40,SR: 0.69,GG: 21.76 for juvenile stage;hR2: 0.48,SR: 0.83;GG: 18.22 for grow-out stage.There are no inbreeding depressions in shell length observed in the SS and SC lines at all sampling days.All of the results indicate that maintaining selection pressure in successive generation may be effective in the selective breeding program of this family.
其他文献
Type 2 diabetes mellitus(T2D)is a metabolic disease characterized by hyperglycemia with complex etiology.There are about 100 million adults with diabetes in
The macrobenthos samples collected from Soutern Bohai sea,China in 2010 and 2011 were identified to clarify the current state of this community,and the hist
随着工业化发展的不断壮大,各种工业生产中产生的恶臭物质逐渐增多。其中,炼油行业尤为突出,在炼油生产过程中会释放大量的硫化物、氮化物等恶臭物质,这些物质排放到大气中会对环境和人类造成严重的危害。为了控制和改善大气质量,为人民生活和生产创造清洁适宜的环境,对各类气体的排放要求越来越高,由此引发的恶臭污染已成为亟待解决的重大环境问题之一本论文以此为出发点开展了恶臭污染调研,指出恶臭污染的治理难度所在,并
充分利用木质纤维素水解液中的所有糖源，是以木质纤维素为原料发酵燃料乙醇的一个关键因素。木糖是木质纤维素中最重要的五碳糖组分，也是自然界仅次于葡萄糖的第二大糖源，因此人
近年来,由于在癌症治疗和生物传感技术方面的潜在应用,生物大分子自组装的研究日益引起人们的兴趣,特别是对DNA纳米组装的研究。DNA的组装结构除双螺旋结构之外,还能形成多链
为适应现代电子封装业中表面贴装技术无铅化的要求,多层片式阻容元件需电镀无铅可焊性镀层。本文研究了在弱酸性甲磺酸盐-碘化物体系中电沉积无铅可焊性Sn-Ag-Cu三元合金镀层工艺,并初步探讨了沉积机理。通过研究镀液组成及工艺条件的影响规律,确定了优化的镀液组成及工艺条件为:Sn(CH3SO3)2 0.18~0.22mol/L,AgI 3.5~5.5mmol/L,Cu(CH3SO3)2 1.0~2.0m
Non-targeted metabolomics experiments performed in the Cornell EnHANCE cohort of young adults followed over the course of their first year of college identi
Uptake and metabolism of food is a highly complex process and requires the coordinated interaction of cells,tissues and organs in multi-cellular organisms t
Diet,particularly macronutrients,have a major influence in shaping gut microbiome both in the short and long term,which in turn can impact metabolic heath.T
随着先进电子技术的飞速发展，对产品加工精度和表面质量的要求越来越高。化学机械抛光(chemical mechanical polishing，简称CMP)技术几乎是迄今唯一可以提供全局平面化的表面精