Dietary Vitamin B2 Requirement of Genetically Improved Farmed Tilapia (Oreochromis niloticus)

JIANG Ming, REN Chun, WEN Hua, WU Fan, YANG Changgeng, LIU Wei, TIAN Juan, ZHOU Mengxin

doi:10.3969/j.issn.1006-267x.2017.11.016

Chinese Journal of Animal Nutrition >

2017 , Vol. 29 >Issue 11: 3962 - 3969

DOI: https://doi.org/10.3969/j.issn.1006-267x.2017.11.016

Molecular Nutrition

Dietary Vitamin B₂ Requirement of Genetically Improved Farmed Tilapia (Oreochromis niloticus)

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1. Fish Nutrition and Feed Division, Yangtze River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Wuhan 430223, China;
2. College of Fisheries, Huazhong Agricultural University, Wuhan 430070, China

Received date: 2017-04-15

Online published: 2017-10-31

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Abstract

The present study was conducted to determine the dietary vitamin B₂ requirement of genetically improved farmed tilapia (GIFT, Oreochromis niloticus). Six experimental diets were formulated to contain 0.4, 2.6, 5.4, 10.8, 20.4 and 39.7 mg/kg vitamin B₂ using casein, dextrin and gelatin as chief feed sources, respectively. Each diet was assigned to three replicates of 15 GIFT[initial body weight=(59.5±0.9) g] which were cultured in recirculating aquaculture system for 10 weeks, and the growth performance, liver vitamin B₂ content, some serum biochemical indices, etc. of GIFT were determined after the cultural experiment. The results showed as follows:with the increase of dietary vitamin B₂ content, the weight gain rate of GIFT first increased linearly and then remained nearly unchanged when dietary vitamin B₂ content came up to 10.8 mg/kg. The results of feed efficiency showed the similar tendency with the result of weight gain rate. Viscerosomatic index in 10.8, 20.4 and 39.7 mg/kg groups were significantly higher than that in 0.4 and 2.6 mg/kg groups (P<0.05), and the hepatosomatic index in 10.8, 20.4 and 39.7 mg/kg groups was significantly higher than that in 0.4 mg/kg group (P<0.05). No significant difference was observed in condition factor among all groups (P>0.05). With the increase of dietary vitamin B₂ content, the crude lipid content in whole fish was firstly increased and then decreased, and it in 5.4 mg/kg group was significantly higher than that in other groups (P<0.05). The moisture content in whole fish in 5.4 mg/kg group was the lowest, which was significantly lower than other groups except 39.7 mg/kg group (P<0.05). The crude protein content in whole fish in 39.7 mg/kg group was the highest, which was significantly higher than other groups except 5.4 mg/kg group (P<0.05). Dietary vitamin B₂ content had no significant effects on the content of ash in whole fish and the contents of moisture, crude protein, crude lipid in muscle and liver (P>0.05). With the increase of dietary vitamin B₂ content, the content of vitamin B₂ in liver increased linearly until came up to 20.4 mg/kg, and then hold steady. The contents of serum total cholesterol and triglyceride and the activities of serum aspartate aminotransferase and alanine aminotransferase in 0.4 mg/kg group were significantly higher than those in other groups (P<0.05). Broken-line model analysis indicates that the dietary vitamin B₂ requirement of GIFT is estimated to be 10.2 mg/kg for maximum growth rate, and 19.3 mg/kg for maximum vitamin B₂ accumulation in liver, respectively.

Key words： GIFT; vitamin B₂; requirement; growth

Cite this article

JIANG Ming, REN Chun, WEN Hua, WU Fan, YANG Changgeng, LIU Wei, TIAN Juan, ZHOU Mengxin . Dietary Vitamin B₂ Requirement of Genetically Improved Farmed Tilapia (Oreochromis niloticus)[J]. Chinese Journal of Animal Nutrition, 2017 , 29(11) : 3962 -3969 . DOI: 10.3969/j.issn.1006-267x.2017.11.016

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