期刊
AQUACULTURE NUTRITION
卷 19, 期 4, 页码 499-505出版社
WILEY-HINDAWI
DOI: 10.1111/anu.12001
关键词
blunt snout bream; choline; growth; lipid deposition; Megalobrama amblycephala; requirement
类别
资金
- Special Fund for Agro-scientific Research in the Public Interest of Ministry [201003020]
- National Technology System for Conventional Freshwater Fish Industries of China [nycytx-49-21]
A 12-week feeding trial was conducted to determine dietary choline requirement for juvenile Megalobrama amblycephala. The basal diet was formulated to contain 310gkg(-1) diet from vitamin-free casein and gelatine. Choline chloride was supplemented to the basal diet to formulate six purified diets containing 0, 250, 500, 1000, 2000 and 4000mg kg(-1), respectively. Each diet was randomly fed to quadrupled groups of Megalobrama amblycephala with initial average weight 1.84 +/- 0.04g in a flow-through system. Results showed weight gain was increased significantly with increasing dietary choline levels (P<0.01). Lipid content of liver decreased significantly as dietary choline concentration increased (P<0.01), whereas lipid content of dressed carcass showed opposite trend (P<0.01), and lipid content of whole-body was unaffected by dietary choline supplementation. Broken- line regression of weight gain, liver and muscle choline concentration showed choline requirements of Megalobrama amblycephala of 1198, 1525 and 1365mg kg(-1), respectively. In addition, dietary choline supplementation significantly improved lipid content of dressed carcass but not the content of whole body of blunt snout bream.
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