论文部分内容阅读
在 30℃水温下进行摄食 -生长实验 (实验周期为 5 6d) ,设饥饿、1%、2 %、4 %和饱食 5个摄食水平 ,研究了中华鳖稚鳖 (39 5 4— 4 4 2 2g)的生长和能量收支。结果表明 ,中华鳖稚鳖的特定生长率随摄食水平的增加 ,其湿重、干物质、蛋白质和能量的特定生长率均呈二次曲线增加 ,其中干物质的特定生长率 (SGRdr)与摄食率 (Rl)的关系式为 :SGRdr=- 1 8799+1 0 795Rl- 0 0 832Rl2 (r=0 90 6 ,n =2 5 ,P <0 0 1) ;除干物质转化效率外 ,湿重、蛋白质和能量的转化效率在 2 %组均达到最大 ,分别为 36 31%、2 1 4 7%和 2 8 10 % ;除能量转化效率外 ,4 %组湿重、干物质和蛋白质的转化效率与最大值均无显著差异 ;摄食水平对中华鳖稚鳖总氮排泄率、氨氮排泄率、尿素氮排泄率以及氨氮占总氮排泄率的比例均有显著影响 (P <0 0 1) ,除氨氮占总氮比例外其他指标均随摄食水平的增加而增加 ,氨氮比例在饥饿组最高为 5 5 83% ,由饥饿到饱食其变化范围是 4 4 5 0 %— 5 5 83% ;总氮排泄率、氨态氮排泄率和尿素氮排泄率的变动范围分别是 19 81%— 6 5 87%、9 4 4 %— 36 31%和 8 2 4 %— 2 9 5 6 % ,回归分析表明 ,幼鳖的总氮排泄率 (μmol/g·d) (G N)、氨氮排泄率 (μmol/g·d) (NH3 N)及尿素氮排泄率 (μmol/g·
The feeding and growth experiments were carried out at the water temperature of 30 ℃ (experiment duration was 56 days). The starvation, 1%, 2%, 4% 2 2g) growth and energy budget. The results showed that the specific growth rate of juvenile soft shelled turtle increased with the increase of feeding level. The specific growth rates of wet weight, dry matter, protein and energy all showed quadratic curve. The specific growth rate (SGRdr) The relation of rate (Rl) is: SGRdr = - 1 8799 + 1 0 795Rl- 0 0 832Rl2 (r = 0 90 6, n = 2 5, P <0 0 1); In addition to the dry matter conversion efficiency, , The conversion efficiency of protein and energy reached the maximum at 2%, 36 31%, 21 47% and 28 10% respectively. In addition to energy conversion efficiency, 4% wet weight, dry matter and protein conversion There was no significant difference in efficiency and maximum value between the two groups. The levels of total nitrogen excretion, ammonia nitrogen excretion, urea nitrogen excretion and ammonia nitrogen to total nitrogen excretion were significantly affected by food intake (P <0.01) In addition to the proportion of ammonia nitrogen and total nitrogen, all the other indexes increased with the increase of feeding level. The highest proportion of ammonia nitrogen in the starvation group was 55.33% and the range of change from starvation to satiation ranged from 45.5% to 55.33%. The ranges of total nitrogen excretion rate, ammonia nitrogen excretion rate and urea nitrogen excretion rate were 19 81% -65 87% and 94 4% respectively, - 36 31% and 8 2 4% - 2 9 5 6%, respectively. Regression analysis showed that the total nitrogen excretion rate (μmol / g · d) (GN) and ammonia nitrogen excretion rate (μmol / g · d) N) and urea nitrogen excretion rate (μmol / g ·