维生素D对中国对虾生长影响的研究

STUDIES ON THE NUTRITIONAL REQUIREMENT OF VITAMIN D FOR SHRIMP

于1990年7－9月用不同维生素D水平的饵料饲喂中国对虾，研究饵料中维生素D的适宜添加量及对对虾的营养作用。结果表明，每百克饵料中添加6000IU维生素D，其体长增长率和增重率最大，蛋白质消化吸收率最好，饵料系数最低；VD对对虾存活率无明显影响；投喂适量的维生素D时，有助于钙、磷在虾体中的吸收、虾壳中的沉积、虾壳的硬化。

To study the proper addition and the nutritional function of VD, different concentrations of VD(0-240IU/g) were used to feed P. chinensis in this experiment.The test shrimps were 8cm length and 7g weight in average and were cultured for35 days.It was found that by addition of 6 000IU of VD per 100g to diets, the rates ofincrease of shrimp length and weight were the largest, the digestion of protein wasthe best, and the feed coefficient was the lowest. It was also found that VD had noobvious effect on the survival rate of shrimps.The experiment showed that different levels of VD affected the amount of somemineral absorbed and deposited by the shrimp. Higher VD concentration helped absorption of phosphorus, lower concentration lielped absorption of calcium, so properVD content in the diets can help the shrimps to absorb calcium and phosphorus andpromote hardening of shrimp shells.