摘要
2011年在上海海洋大学鱼类种质研究试验站对"新吉富"罗非鱼选育后期F13、F14、F15 3个世代群体的生长性能进行了比较,67 d的试验结果表明:(1)F13、F14、F15 3个选育世代的平均试验末体重分别为:195.7、213.4和218.3 g,方差分析表明,F14和F15世代间的生长速度差异不显著(P=0.483),但F14、F15的生长速度显著快于F13(P<0.05);(2)F13、F14、F15 3个选育世代的绝对增重率分别为2.39、2.61和2.74 g/d,其中,F15比F14提高4.98%,F14比F13提高9.21%,生长速度逐代提高的平均值为7.10%,F13-F15生长性状的选择响应约为7.10%;(3)F13、F14、F15 3个选育世代的体重变异系数分别为:6.33%、4.87%和1.60%,即F13>F14>F15,呈现出逐代降低的趋势。据此可以推测,在连续定向选育过程中,"新吉富"罗非鱼的遗传改良进程并没有停止,尚未到达选育极限。
Growth performance of NEW GIFT strain of Nile tilapia（Oreochromis niloticus）from F13 to F15 was compared at Experimental Station for Fish Germplasm of Shanghai Ocean University for 67 days in 2011.The results showed that：（1） The body weights of F13-F15 at the end of the experiment were 195.7 g,213.4 g,218.3 g,respectively.Analysis of variance showed that growth rate of F14 and F15 was significantly faster than F13（P0.05）,but no significant difference was detected between F14 and F15（P=0.483）;（2） The averages of daily body weight gain of F13-F15 of the total experiment periods were 2.39 g/d,2.61 g/d,2.74 g/d respectively.F15 was 4.98% higher than F14,and F14 was 9.21% higher than F13.The average improvement of growth rate per generation was 7.10%.It could be considered that selection response to growth performance of F13-F15 of NEW GIFT strain was about 7.10%;（3） The variation coefficients of body weight of F13-F15 were 6.33%,4.87%,1.60% respectively at the end of the experiment,namely F13F14F15,which suggested that the variation coefficient decreased with selection progress.It is conjectured that genetic improvement of NEW GIFT strain never stopped in the course of continuous selection.The fixation of major gene controlling growth was in progress.There is a certain distance from the selection limit.
出处
《上海海洋大学学报》
CAS
CSCD
北大核心
2013年第1期1-6,共6页
Journal of Shanghai Ocean University
基金
现代农业产业技术体系专项资金(CARS-49-04B)
