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| Effects of Dietary Vitamin E on Growth and Gonadal Development in Nile Tilapia Oreochromis niloticus |
| ZHANG Xu1, TANG Zhanyang1.2, HUANG Kai1, WANG Liqun1, SU Zhijian1, LIU Ting1, WANG Jingjie1, MA Yanqun1 |
1. College of Animal Science and Technology, Guangxi University, Nanning 530004, China;
2. Guangxi Academy of Fishery Sciences, Nanning 530021, China |
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Abstract Females with initial body weight of (19.81±3.90) g and male with initial body weight of (18.55±3.65) g of Nile tilapia Oreochromis niloticus were fed basic diet containing 0 mg/kg (control group), 40 mg/kg, 80 mg/kg, 120 mg/kg and 160 mg/kg vitamin E at water temperature of (28.0±0.5) ℃ for 30 d. Then HE staining technique was used to make gonad and intestinal histological sections of female and male tilapia under different vitamin E concentrations to investigate the effects of dietary vitamin E on the reproductive performance, growth coefficient and intestinal morphology of female and male Nile tilapia. The results showed that the female tilapia fed the diet containing 120 mg/kg of vitamin E had the significantly higher intestinal villus height, the best growth performance and ovarian maturity. The male Nile tilapia fed the diet containing 160 mg/kg of vitamin E had the best growth performance and the best developed testis. There was no significant effect of supplementation of vitamin E on intestinal morphology of male Nile tilapia (P>0.05). The findings indicated that appropriate amount dietary vitamin E led to promote the gonad development of female and male Nile tilapia, the reproductive performance, the morphology and structure of intestinal tissue, and digestion and absorption of nutrients, which not only provided theoretical basis for the histological research of tilapia, but also provide a strong support for the healthy and sustainable development of the tilapia industry in the future.
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Received: 30 September 2019
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