Estimated heritability of sex ratio and sexual dimorphism in tilapia
Estimated heritability of sex ratio and sexual dimorphism in tilapia
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DOI：
10.1111/j.1365-2109.1989.tb00364.x
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发表时间：
1989-10
影响因子：
2
通讯作者：
L. Lester;K. S. Lawson;T. Abella;M. Palada
中科院分区：
文献类型：
--
作者：
L. Lester;K. S. Lawson;T. Abella;M. Palada
。有证据表明，尼罗河Oreochromis niloticus （L.）的性别决定具有多因素的遗传决定。采用相同的饲养方法，在同一池塘的不同悬挂网罩和笼子中饲养的niloticus家族在14周龄时进行性别鉴定和称重。根据Bull， Vogt & Bulmer（1982）的方法估计性别比的遗传力为0.26（95%可信区间= 0.13-0.48）。性别二态性的遗传力，即雄性和雌性兄弟姐妹体重之间的偏差量，经标准方差成分分析估计为零。给出了性别比与各家庭规模参数的相关关系。这些结果在早期关于罗非鱼物种性别比例随温度变化变化的报告的背景下进行了讨论。讨论了这些结果对罗非鱼生长率遗传改良的意义。
. Evidence is presented that sex determination in Oreochromis niloticus (L.) has a multifactorial genetic determination. Families of O. niloticus reared in separate suspended net enclosures and cages in the same pond using the same procedures were sexed and weighed at 14 weeks of age. Heritability of sex ratio was estimated by the method of Bull, Vogt & Bulmer (1982) to be 0.26 (95% confidence interval = 0.13-0.48). The heritability of sexual dimorphism, the amount of deviation between weights of male and female siblings, was estimated by standard variance component analysis to be zero. Correlations between sex ratio and parameters of size of each family are given. The results are discussed in the context of earlier reports on changes in sex ratio of tilapia species in response to temperature changes. The implications of these results for genetic improvement of growth rate of tilapia are discussed.