完全或部分的食物剥夺对中华鳖(Pelodiscus sinensis)幼体补偿生长反应的影响:生长率的时间变化模式与体组成的变化

为了探究中华鳖（Pelodiscus sinensis）幼体的补偿生长能力，我们对中华鳖幼鳖（平均湿重9．56g）进行如下6种处理：饥饿0（对照）、1、2、3、4周，或者食物限制4周，即只投喂体湿重百分之一的食物；然后对各组进行饱食处理直到10周的实验结束为止。结果发现在饱食期的第一周各饥饿处理组的特殊生长率均显著高于对照组（P〈0．05），但是终体重均没有赶上对照组。当饥饿或食物限制结束时，脂肪含量随着饥饿期的延长而降低，灰分和水分则表现出相反的变化趋势：脂肪含量显著低于对照（P〈0．05），而灰分和水分则显著高于对照（P〈0．05）。蛋白含量则没有显著变化（P〉0．05）。实验结束时，除了灰分外（P〈0．05），其他个体组成指标均恢复到对照组的水平。以上结果表明中华鳖幼体在饥饿胁迫下首先利用脂肪作为主要能源以维持生存，以及在该研究条件下完全的食物剥夺可以诱发其部分补偿生长反应．而部分食物剥夺则不能诱发此反应。

Effects of partial and complete food deprivation on compensatory growth of juvenile soft-shelled turtle (pelodiscus sinensis): temporal patterns in growth rate and changes in body composition

To ascertain compensatory growth capability of juvenile soft-shelled turtles(Pelodiscus sinensis),the turtles with an average body weight of 9.56g were treated with one of the following regimes: full food deprivation for 0(control),1,2,3 and 4 weeks,respectively;Partial deprivation by feeding with the equivalent of one per cent of mean body weight for 4 weeks,and then the turtles in each group were fed to apparent satiation until the end of the 10-week experiment.Each fully food deprived group showed significantly higher specific growth rate than the control during the first re-feeding week,but the final body weight of all food deprived groups did not exceed the control.By the end of the deprivation period,body lipid content showed a decreasing trend with increasing duration of food deprivation,while body ash and moisture contents showed a clear reverse trend: lipid content was significantly lower in each deprived group than the control,but ash content or moisture content was significantly higher than the control.No significant differences were found in protein content among all groups.Final body lipid,protein and moisture restored to the control level,but ash did not.The results indicated that the juvenile turtles subjected to starvation firstly consumed fat as their main energy source,and full food deprivation could trigger a partially compensatory growth response,whereas partial deprivation failed to introduce the compensatory response.