日粮水平对中华鳖稚鳖生长的影响

Effect of Ration Level on Growth in Juvenile Soft-shelled Turtles,Trionyx sinensis

于 2 0 0 1年 1 2月购买当年繁殖的中华鳖 (Trionyxsinensis)稚鳖 ( 2 8 6 6～ 5 3 3 7g) ,在 3 0℃水温下进行摄食 -生长实验 (实验时间为 5 6d) ,设饥饿、 1 %、 2 %、 4 %和饱食 5个日粮水平 ,研究了摄食水平对中华鳖稚鳖生长和转化效率的影响。方差分析表明 :摄食水平对中华鳖稚鳖的特定生长率和转化效率均有显著影响。稚鳖的湿重、干重、蛋白质和能量的特定生长率均随摄食水平的增加呈二次曲线增加 ,摄食率 (RL) -干物质特定生长率 (SGRd)的关系模型可表示为 :SGRd=- 0 0 83 2RL2 + 1 0 795RL - 1 8779(n =2 5 ,r2 =0 90 6 ,F =1 0 5 4 6 ) ;当摄食率为 6 97%、 6 4 9%、 6 0 8%和 6 3 4 %时 ,稚鳖湿重、干重、蛋白质和能量的特定生长率分别达到最大值。 1 %组的各项转化效率均显著低于 2 %和 4 %组 ,干重和能量转化效率显著低于饱食组 ;2 %组的干重和能量转化效率显著高于 4 %和饱食组。

The growth trial of a 56-day period was conducted at 30℃ to investigate the effect of ration on growth and feed conversion efficiency in juveniles Trionyx sinensis,which initial body weights ranged from 28.66 to 53.37g.They were fed commercial soft-shelled turtle diet twice a day at five ration levels (starvation,1%,2%,4% and satiation).ANOVA showed that specific growth rate (SGR) and conversion efficiency (K) were significantly affected by the ration level.SGR increased quadratically with increasing ration,and the relationship between SGR for dry matter (SGR d) and ration level (RL) could be expressed as the follow:SGR d=-0.0832RL 2+1.0795RL-1.8779(n=25,r 2=0.906,F=105.46).The maximum SGR for wet matter,dry matter,protein and energy appeared when ration levels were 6.97%,6.49%,6.08% and 6.34%,respectively.All Ks at 1% ration group were significantly lower than those at 2% and 4%,and Ks for dry matter and energy were lower than the satiation;Ks for dry matter and energy at 2% were significantly higher than those at the satiation.