Estimation of genetic parameters for growth traits of Japanese flounder <Emphasis Type="Italic">Paralichthys olivaceus</Emphasis> using an animal model |
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Authors: | Yong-Xin Liu Gui-Xing Wang Yu-Fen Wang Fei Si Zhao-Hui Sun Xiao-Yan Zhang Jia-Di Wang Hai-Jin Liu |
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Institution: | (1) Chinese Academy of Fishery Science, 150 Qingta, Yongdinglu-nan, Beijing, 100141, China;(2) Beidaihe Central Experiment Station, Chinese Academy of Fishery Science, 7, Jinshanzuilu, Qinhuangdao, 066100, China; |
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Abstract: | To estimate genetic parameters of growth traits in Japanese flounder Paralichthys olivaceus, full-sib and half-sib families were produced in three consecutive years at the Beidaihe Central Experiment Station in China.
Each year 8–28 families were produced. The body weight, body length and body depth at 180, 240, and 360 days of age were measured
for 5,224 individuals. Four animal models were used to examine the phenotypic variation of growth traits and were compared
using the likelihood ratio test. The results showed that estimates for additive genetic effect heritabilities varied greatly
depending on the model, trait and age. The maternal effect had a significant impact on phenotypic variation only for body
depth at 180 days of age, which explained 49% of the phenotypic variance. The ratio of full-sib effect to phenotypic variation
ranged from 0.09 to 0.22. Growth traits all exhibited low heritability (0.13–0.39), indicating that there is the potential
for family selection breeding for these traits in Japanese flounder. Using the full model with the fixed, full-sib family,
additive and maternal genetic effects, genetic correlations among the three traits for fish of the same age were estimated
to be more than 0.80. Generally, the genetic correlations gradually increased as age increased. |
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