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首页> 外文期刊>African Journal of Biotechnology >Association of transforming growth factor-3 gene polymorphism with growth and body composition traits in Iranian commercial broiler lines
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Association of transforming growth factor-3 gene polymorphism with growth and body composition traits in Iranian commercial broiler lines

机译：伊朗商业肉鸡品系中转化生长因子3基因多态性与生长和身体成分性状的关联

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This study is aimed at evaluating when sex could be determined in beluga by examining levels of plasma steroids. Blood was taken from beluga from two stations (Shahid Rajaee: SR, Sari farm: SI) which were kept at 19°C at the age of 24 and 36 months and plasma testosterone (T), 11-ketotestosterone (KT) and estradiol (E2) concentrations and plasma calcium were determined. The results revealed that, plasma T and KT levels were significantly higher in males than females in both stations at the age of 24 and 36 months (P<0.05). There were no differences in E2 and calcium concentrations between males and females at both ages. In addition, the results showed that, plasma T increased significantly in both locations, with increasing age from 24 to 36 months. Histological analysis of gonads revealed that all but six of the SI farm fish at the age of 24 months had well differentiated testes with spermatogonia undergoing mitosis in cysts (Stage 2). The six of the population in SI farm, which had no differentiated gonad, had also the lowest weight in comparison to differentiated fish. It also appears that proliferation of spermatogonia is necessary for production of androgens and growth rate is influenced by water temperature. The results of this study revealed that, plasma T and KT can be used as good markers to determine the sex in the early life stage of beluga.
机译：这项研究旨在通过检查血浆类固醇水平来评估何时可以在白鲸中确定性别。从两个站点（Shahid Rajaee：SR，Sari农场：SI）的白鲸中抽取血液，分别在24和36个月大的时候保持在19°C，血浆睾丸激素（T），11-酮睾丸酮（KT）和雌二醇（ E2）浓度和血浆钙测定。结果显示，在24和36个月大时，两个站的男性血浆T和KT水平显着高于女性（P <0.05）。男女在这两个年龄段的E2和钙浓度均无差异。此外，结果表明，血浆T在两个部位均显着增加，年龄从24个月增加到36个月。性腺的组织学分析表明，在24个月大时，除六只SI养殖鱼类外，其余所有鱼类的睾丸分化程度都很高，精原细胞的囊肿有丝分裂（阶段2）。与分化鱼相比，SI养殖场中没有分化性腺的六个人口的体重也最低。似乎精原细胞的增殖对于雄激素的产生是必需的，并且生长速度受水温的影响。这项研究的结果表明，血浆T和KT可以作为确定白鲸早期生命阶段性别的良好标记。

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