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Effects of Feed Processing Technology and Vitamin Addition on Growth Performance, Nutrient Retention and Serum Biochemical Indices of Tilapia, Oreochromis aureus×Tilapia nilotica

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  • 1. College of Fisheries and Life Science, Shanghai Ocean University, Shanghai 201306, China;
    2. Key Laboratory of Freshwater Fishery Germplasm Resources, Ministry of Aquaculture, Shanghai 201306, China;
    3. Shanghai Engineering Research Center of Aquaculture, Shanghai 201306, China;
    4. Shanghai University Knowledge Service Platform, Aquatic Animal Breeding Center ( ZF 1206), Shanghai Ocean University, Shanghai 201306, China

Received date: 2014-03-19

  Online published: 2014-09-10

Abstract

This experiment was conducted to investigate the effects of feed processing technology and vitamin addition on growth performance, nutrient retention and serum biochemical indices of tilapia, Oreochromis aureus×Tilapia nilotica. A basal diet containing 0.50% vitamin premix was formulated, and a pelleted diet and an extruded diet were prepared. In addition, the other two extruded diets containing 0.66% and 0.82% vitamin premix were prepared, respectively, then four diets were fed to the tilapia with an average body weight of (8.0±0.1) g for 8 weeks. Each group contained 3 replicates of 35 fish per replicate. The results showed as follows: 1) under the same formula condition, compared with the fish fed the pelleted diet, the weight gain rate (WGR) of the fish fed the extruded diet was increased by 8.91% (P<0.05), while the feed conversion ratio (FCR) was decreased by 9.42% (P<0.05); moreover, the hepato-somatic index (HSI), whole-body crude protein content, nutrition retention ratios[including protein efficiency ratio (PER), protein retention ratio (PRR), lipid retention ratio (LRR) and energy retention ratio (ERR)], serum alanine transaminase(ALT) and aspartate transaminase (AST) activities and serum triglyceride (TG) content were all significantly increased (P<0.05 or P<0.01). 2) Among the extruded diets, with the vitamin premix addition increased from 0.50% to 0.66%, the WGR, SGR, PER, PRR and ERR were significantly increased (P<0.05), while the FCR and whole-body ash content were significantly decreased (P<0.05). There were no further improvements in growth performance and nutrient retention ratios with the vitamin premix addition increased from 0.66% to 0.82%. It is concluded that the tilapia fed the extruded diet have a better growth performance and a higher nutrient retention ratio than the tilapia fed the pelleted diet with the same formula. Adding vitamin premix with a proper excessive amount in the extruded diet can improve the growth performance and dietary nutrition utilization of tilapia.

Cite this article

MA Fei, LI Xiaoqin, LI Baian, GAN Tian, LENG Xiangjun . Effects of Feed Processing Technology and Vitamin Addition on Growth Performance, Nutrient Retention and Serum Biochemical Indices of Tilapia, Oreochromis aureus×Tilapia nilotica[J]. Chinese Journal of Animal Nutrition, 2014 , 26(9) : 2892 -2901 . DOI: 10.3969/j.issn.1006-267x.2014.09.054

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