Optimum protein requirement of juvenile orange-spotted grouper (Epinephelus coioides)

被引:16
|
作者
Yan, Xiaobo [1 ,2 ]
Yang, Junjiang [1 ]
Dong, Xiaohui [1 ,2 ,3 ]
Tan, Beiping [1 ,2 ,3 ]
Zhang, Shuang [1 ,2 ,3 ]
Chi, Shuyan [1 ,2 ,3 ]
Yang, Qihui [1 ,2 ,3 ]
Liu, Hongyu [1 ,2 ,3 ]
Yang, Yuanzhi [1 ]
机构
[1] Guangdong Ocean Univ, Coll Fisheries, Lab Aquat Nutr & Feed, Zhanjiang 524088, Peoples R China
[2] Aquat Anim Precis Nutr & High Efficiency Feed Eng, Zhanjiang 524088, Peoples R China
[3] Minist Agr, Key Lab Aquat Livestock & Poultry Feed Sci & Tech, Zhanjiang 524000, Guangdong, Peoples R China
基金
国家重点研发计划; 中国国家自然科学基金;
关键词
DIETARY-PROTEIN; GROWTH-PERFORMANCE; BODY-COMPOSITION; FEED-UTILIZATION; DIGESTIVE ENZYMES; METABOLIC PROFILE; ENERGY RATIO; LIPID-LEVELS; LEVEL; PLASMA;
D O I
10.1038/s41598-021-85641-4
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
The purpose of subject was to explore the optimum protein requirement of juvenile grouper (Epinephelus coioides). In the test, 450 juveniles with an average weight (10.02 +/- 0.22) g were randomly divided into six groups with triplicate, and were fed with 350, 400, 450, 500, 550 and 600 g/kg iso-lipid test diet twice 1 day for 8 weeks, respectively. The results showed that: (1) With the increase of protein level, the body weight gain rate and specific growth rate first increased and then reduced, while the feed coefficient rate first decreased and then increased, while the protein efficiency significantly decreased (P<0.05). (2) With the increase of protein level, the condition factor, hepaticsomatic index and visceralsomatic index significantly reduced (P<0.05). (3) With the increase of protein level, the crude protein content of whole fish and muscle gradually increased, while the crude lipid content gradually decreased. (4) High-protein diet (550-600 g/kg) significantly increased the plasma total protein content and decreased the triglyceride content of orange-spotted grouper (P<0.05). (5) Compared with the 350 g/kg group, 500, 550, 600 g/kg groups significantly increased the activities of glutamic-pyruvic transaminase and glutamic oxaloacetic transaminase in liver (P<0.05). (6) With the increase of protein level, the protease activity of intestine first increased and then decreased, and reached the maximum at the protein level of 500 g/kg, while lipase and amylase decreased significantly (P<0.05). (7) The activities of acid phosphatase, superoxide dismutase and lysozyme in liver increased first and then decreased with the increase of protein level, and reached the maximum in the 400 g/kg protein group. According to the analysis specific growth rate, the optimum protein level of juvenile orange-spotted grouper is 521.84 g/kg.
引用
收藏
页数:9
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