水生生物学报2013，Vol.37Issue(2)：235-242,8.DOI:10.7541/2013.10
罗非鱼对晶体蛋氨酸、包膜蛋氨酸利用的比较研究
COMPARISON STUDY ON UTILIZING CRYSTALLINE OR COATED METHIONINE BY TILAPIA (OREOCHROMIS NILOTICUS ×O.AUREUS)
摘要
Abstract
The present study was conducted to compare the ability of utilizing crystalline and coated methionine (Met) in diet of tilapia (Oreochromis niloticus × O. aureus). Four diets with iso-lipid and iso-nitrogen were designed as fish meal diet (FMD, 9% fish meal), non-fish meal diet (NFMD, 0% fish meal), crystalline Met diet (Cr-Met) and coated Met diet (Co-Met) with crystalline Met or coated Met addition in NFMD to obtain the same Met level as FMD. Tilapia with initial body weight of (1.22 ± 0.07) g was fed the four diets for 8 weeks. The results showed that weight gain (WG) of the four groups were 1642.7%, 1250.3%, 1362.0% and 1451.7%, feed conversion rate (FCR) were 1.08, 1.45, 1.30 and 1.21, respectively. Compared with NFMD group, WG increased by 8.9% and 16.1% (P<0.05), and FCR decreased by 10.34% and 16.55% (P<0.05) by the addition of crystalline or coated Met in diet. Liver glutamic-pyruvic transaminase (GPT), glutamic-oxaloacetic transaminase (GOT) activity peak appeared at 2h and 4h after ingesting for fish in FMD and NFMD groups, which was advanced to lh after ingesting for Cr-Met group, and delayed to 5h after ingesting for Co-Met group. The Plasma GOT, GPT activity had a similar variation trend to that of liver's. The digestive trial showed that fish of fed FMD had the highest, and which of fed NFMD had the lowest digestibilities of dry matter (DM) and crude protein (CP). Compared with NFMD group, DM and CP digestibilities were significantly improved by the addition of crystalline Met and coated Met in diet. These results showed that the growth and nutrients digestibility of tilapia could be improved by adding crystalline Met and coated Met in practical diet deficient in Met. Tilapia can utilize coated Met more efficiently than crystalline Met.关键词
罗非鱼/晶体蛋氨酸/包膜蛋氨酸/生长/转氨酶Key words
Tilapia/ Crystalline methionine/ Coated methionine/ Growth/ Transaminase分类
农业科技引用本文复制引用
冷向军,田娟,陈丙爱,李小勤,文华..罗非鱼对晶体蛋氨酸、包膜蛋氨酸利用的比较研究[J].水生生物学报,2013,37(2):235-242,8.基金项目
上海市重点学科建设项目(Y1101) （Y1101）
罗非鱼现代产业技术体系建设经费(CARS-49) （CARS-49）
2010年公益性行业(农业)科研专项经费(201003020)资助 （农业）
