Genetic parameters for different growth scales in GIFT strain of Nile tilapia (Oreochromis niloticus)
文献类型： 外文期刊
作者： He, J. 1 ; Gao, H. 3 ; Xu, P. 2 ; Yang, R. 1 ;
作者机构： 1.Chinese Acad Fishery Sci, Res Ctr Aquat Biotechnol, Beijing 100141, Peoples R China
2.Chinese Acad Fishery Sci, Freshwater Fisheries Res Ctr, Wuxi, Peoples R China
3.Dalian Ocean Univ, Sch Fisheries & Life Sci, Dalian, Peoples R China
关键词： Absolute growth;allometry;genetic parameter;nile tilapia;random regression model
期刊名称：JOURNAL OF ANIMAL BREEDING AND GENETICS （ 影响因子：2.38； 五年影响因子：2.54 ）
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收录情况： SCI
摘要： Body weight, length, width and depth at two growth stages were observed for a total of 5015 individuals of GIFT strain, along with a pedigree including 5588 individuals from 104 sires and 162 dams was collected. Multivariate animal models and a random regression model were used to genetically analyse absolute and relative growth scales of these growth traits. In absolute growth scale, the observed growth traits had moderate heritabilities ranging from 0.321 to 0.576, while pairwise ratios between body length, width and depth were lowly inherited and maximum heritability was only 0.146 for length/depth. All genetic correlations were above 0.5 between pairwise growth traits and genetic correlation between length/width and length/depth varied between both growth stages. Based on those estimates, selection index of multiple traits of interest can be formulated in future breeding program to improve genetically body weight and morphology of the GIFT strain. In relative growth scale, heritabilities in relative growths of body length, width and depth to body weight were 0.257, 0.412 and 0.066, respectively, while genetic correlations among these allometry scalings were above 0.8. Genetic analysis for joint allometries of body weight to body length, width and depth will contribute to genetically regulate the growth rate between body shape and body weight.
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