Effect of excessive dietary vitamin D on growth of soft-shelled turtle, Pelodiscus sinensis under dark environment

無光照環境下過量之飼料維生素D對甲魚成長之影響

周聖捷(Saint-Jet Chou) ； 黃承輝(Chen-Huei Huang)

《臺灣水產學會刊》 44卷4期 (2017/12) Pp. 249-254

https://doi.org/10.29822/JFST.201712_44(4).0004

摘要

A feeding trial was performed to investigate the effect of 1,000 folds of normally required dietary vitamin D level for most animals on the growth of soft-shelled turtles reared under dark environment. The turtles were kept in an environment without light-exposure and fed with casein-based diets containing 0, 3.8, 12.0, 23.4, or 37.2 mg vitamin D_3/kg for 10 weeks. No significant differences (p ＞ 0.05) were observed among muscle compositions of the turtles fed with different experimental diets. The growth performance and feed utilization efficiency of the turtles fed with diet containing 37.2 mg vitamin D_3/kg were significantly lower (p ＜ 0.05) than other groups. Liver and muscle vitamin D_3 concentrations increased linearly when dietary vitamin D_3 increased. Soft-shelled turtles apparently are able to tolerate dietary vitamin D_3 up to 12~23 mg/kg. A dietary vitamin D_3 level of 37.2 mg/kg inhibited the growth for turtles reared under dark environment.

關鍵字

soft-shelled turtle ； dark ； vitamin D ； cholecalciferol

並列摘要

本研究探討在無光線環境下餵食高量維生素D對甲魚成長、硬組織鈣磷、組織維生素D_3含量之影響。使用100隻平均重量6.0克之甲魚苗，以20重複個別飼養方式於無光照的環境中，餵飼維生素D_3含量分別為0, 3.8, 12.0, 23.4, 37.2 mg/kg之5組飼料進行10週養殖試驗。甲魚之增重在飼料維生素D_3含量達到23 mg/kg左右開始下降，投餵37.3 mg/kg維生素D_3飼料的甲魚成長顯著低於投餵0到12 mg/kg的甲魚。甲魚投餵不同維生素D含量之飼料不影響甲魚肌肉一般成分組成。肝臟與肌肉組織中的維生素D_3與飼料維生D_3呈現直線相關。在本研究之飼養條件下，飼料維生素D_3含量高於23 mg/kg時可能造成維生素D的過多症。

並列關鍵字

甲魚 ； 黑暗環境 ； 維生素D ； 膽鈣醇