动物营养学报2017，Vol.29Issue(11)：4085-4092,8.DOI:10.3969/j.issn.1006-267x.2017.11.030
细鳞鲑幼鱼对饲料中维生素E的需求量
Requirement of Dietary Vitamin E for Juvenile ManchurianTrout ( Brachymystax lenok)
摘要
Abstract
This study was conducted to investigate the effects of dietary different levels of vitamin E on growth performance, serum biochemical indicators and vitamin E accumulation in body, and to determine the vitamin E requirements of manchurian trout ( Brachymystax lenok) . A total of 600 juvenile manchurian trout with an in-itial body weight of (40.2±3.6) g were randomly divided into 6 groups with 3 replicates per group and 15 fish per replicate. The fish were fed six isonitrogenous and isoenergetic diets containing different levels ( measured values were 16.6, 64.9, 165.5, 316.2, 615.5 and 1214.7 mg/kg, respectively) of vitamin E. The experi-ment lasted for 120 days. The results showed as follows:1) the final weight ( FW) , weight gain rate ( WGR) and special growth rate ( SGR) of manchurian trout were firstly increased and then decreased with dietary vita-min E level increasing. The FW of manchurian trout in 165.5 mg/kg group was significantly higher than that in other groups (P<0.05). The WGR and SGR of manchurian trout in 165.5 mg/kg group were significantly higher than those in 16.6 and 1214.7 mg/kg groups ( P<0.05) . There were no significant differences in feed intake rate, feed conversion rate and protein efficiency rate of manchurian trout among all groups (P>0.05). 2) With the dietary vitamin E level increasing, the serum triglyceride ( TG) and total cholesterol ( TC) con-tents were gradually decreased, which in 615.5 and 1214.5 mg/kg groups were significantly lower than those in the other groups ( P<0.05) . With the dietary vitamin E level increasing, the serum high density lipoprotein cholesterol (HDL-C) content firstly increased and then decreased, which in 165.5 mg/kg group was signifi-cantly higher than that in other groups ( P<0.05) , while which in 64.9 and 615.5 mg/kg groups was signifi-cantly higher than that in 16.6, 615.5 and 1214.5 mg/kg groups ( P<0.05) . The serum low density lipopro-tein cholesterol ( LDL-C ) content had the opposite trend with HDL-C content, which in 165. 5 and 316.2 mg/kg groups was significantly lower than that in other groups (P<0.05). There were no significant differences in the activities of alanine aminotransferase ( ALT) and aspartate aminotransferase ( AST) in serum among all groups ( P>0.05) . 3) With the dietary vitamin E level increasing, the liver vitamin E accumulation was significantly increased ( P<0.05) except that in 15.5 and 1214.5 mg/kg groups ( P>0.05) . The muscle vitamin E accumulation was increased with the dietary vitamin E level increasing, which constant on a level when dietary vitamin E level exceeded 165.5 mg/kg, and the muscle vitamin E accumulation in 165.5, 316.2, 615.5 and 1214.5 mg/kg groups was significantly higher than that in 16.6 and 64.9 mg/kg groups ( P<0.05) . Therefore, dietary appropriate vitamin E supplemental level can improve the growth performance and serum bi-ochemical indicators of manchurian trout, and increase the accumulation of vitamin E in liver and muscle. Ac-cording to the broken-line models, WGR and muscle vitamin E accumulation are used as evaluation indexes, the requirement of vitamin E is 145.87 and 180.98 mg/kg, respectively.关键词
细鳞鲑/维生素E/生长性能/血清生化指标/需求量Key words
Brachymystax lenok/vitamin E/growth performance/serum biochemical indicators/requirement分类
农业科技引用本文复制引用
常杰,牛化欣,胡宗福,于建华,李树国..细鳞鲑幼鱼对饲料中维生素E的需求量[J].动物营养学报,2017,29(11):4085-4092,8.基金项目
国家自然科学基金(31260638,31360640,31460692) （31260638,31360640,31460692）
内蒙古自治区高等学校"青年科技英才资助计划"项目(NJYT-14-B13) （NJYT-14-B13）
