Effect of two choline sources on the performance of postlarval Marsupenaeus japonicus bate.

摘要

The present study was conducted to clarify the effect and the interaction between two choline sources [choline chloride (CC) and soyabean phosphatidylcholine (SPC)] on the performances of postlarval shrimp, Marsupenaeus japonicus. A 30-day feeding experiment was conducted as a 2x2 factorial design. The postlarval shrimp were fed with four kappa -carrageenan micro-bound diets that contained two levels of CC (0.6 and 1.2 g kg-1) and two levels of SPC (20 and 40 g kg-1). A significant (P<0.05) interaction was also detected between both choline sources in terms of the weight gain, apparent feed efficiency ratio, apparent protein efficiency ratio and total lipid, free choline and phosphatidylcholine contents of the shrimp whole body except for survival, moisture, and protein contents of the whole body. At the lower dietary SPC (20 g kg-1) level, increasing of CC level from 0.6 to 1.2 g kg-1 significantly enhanced the above parameters, whereas such positive effect of dietary CC was diminished at the higher dietary SPC (40 g kg-1) level. Standing on the different viewpoint, the effect of supplemental SPC was also affected with the dietary levels of CC..