Maternal testosterone in the avian egg enhances postnatal growth
Maternal testosterone in the avian egg enhances postnatal growth
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DOI：
10.1016/0300-9629(96)00009-6
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发表时间：
1996-07-01
影响因子：
2.3
通讯作者：
Schwabl, H
中科院分区：
文献类型：
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作者：
Schwabl, H
金丝雀（Serinus canaria）的卵含有不同剂量的母体睾丸激素。报告的实验研究是否睾酮影响雏鸟的生长，以及这是如何相互作用的巢伴侣的异步孵化所造成的增长的差异。注射睾丸激素到未孵化的鸡蛋的蛋黄增强孵化后的增长相比，雏鸟孵化同时从控制鸡蛋。这些差异是在孵化后22小时内建立的。外源性睾酮促进了两性的生长，对照组的生长没有性别差异。睾丸激素处理的小鸡也更经常地乞求食物。先前的研究表明，在一窝中随后产下的每个卵子中，母体睾酮的含量都会增加。与通过睾酮注射获得的结果一致，从具有较高浓度的母体睾酮的蛋中孵化的雏鸟比从具有较低睾酮浓度的蛋中同步孵化的小鸡生长更快，然而，更多的睾酮并不能补偿由于离合器的异步孵化而导致的后期孵化所引起的生长减少。母体睾酮对生长的这种直接影响与灵活的孵化起始相结合，可以选择性地增强一窝个体后代的生长和适应性。
The eggs of the canary (Serinus canaria) contain variable doses of maternal testosterone. The reported experiments investigated whether testosterone influences nestling growth and how this interacts with differences of the growth of nest mates that are caused by asynchronous hatching. Injections of testosterone into the yolk of unincubated eggs enhanced the growth after hatching compared to nestlings that had hatched simultaneously from control eggs. These differences were established within 22 hr of hatching. Exogenous testosterone promoted growth in both sexes and there was no sexual difference in the growth of control birds. Testosterone-treated chicks also begged more often for food. Previous studies have shown that the content of maternal testosterone increases in each subsequently laid egg in a clutch. Consistent with the results obtained by testosterone injections nestlings that hatched from eggs with higher concentrations of maternal testosterone grew faster compared to chicks that hatched synchronously from eggs with lower testosterone concentrations, However, more testosterone did not compensate for reduced growth that was caused by later hatching due to asynchronous incubation of clutches. This direct effect of maternal testosterone on growth in combination with a flexible onset of incubation allows to selectively enhance the growth and fitness of individual offspring of a brood.