甲基睾丸素对中华鳖外部性征诱导作用的研究

采用甲基睾丸素处理不同发育时期的中华鳖胚胎和给孵出后３ｄ的稚鳖拌饲甲基睾丸素来观察外源性激素的诱导作用，结果表明：试验组与对照组的孵化率无显著差异。说明孵化率不受生激素处理的影响，经雄性激素处理过的所有个体外部雄性副性征明显，其尾巴长，露出背板的裙边，且好咬斗，这充分证明外源雄性激素对稚鳖的外部性征及胃较大的诱导作用。

A STUDY ON INDUCTION EFFECTS OF METHYL TESTOSTERONE ON THE MORPHOLOGICAL TRAITS OF THE CHINESE SOFTSHELL TURTLE (Trionyx sinensis)

The experiments were caried out by using two methods. First, the embryos in different developmental stages of the Chinese softshell turtle were treated by the exogenous male hormone methyl testosterone. Second, the young Chinese softshell turtles were fed with methyltestosterone 3 days after being hatched. The experimental results showed that there was no significant difference in hatching rate between the experimental group and the contrast group. This also shows that exogeneous male hormone has no effect on the hatching rate. The secondary male characteristics occurred on all individuals of the Chinese softshell turtle treated with exogeneous male hormone. For example, their thicker and longer tails were exposed out of the shell; furthermore, the treated young Chinese softshell turtles turned to be agonistic. All these mentioned above proved that the exogeneous male hormone had effects on the differetiation of seconda