Aquaculture Nutrition

Effects of Different Starch Sources on Pellet Quality of Extruded Feed and Apparent Digestibility of Genetic Improvement of Farmed Tilapia (Oreochromis niloticus,GIFT)

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  • 1. Dalian Ocean University, Dalian 116023, China;
    2. National Aquafeed Safety Assessment Station, Feed Research Institute, Chinese Academy of Agricultural Sciences, Beijing 100081, China

Received date: 2014-03-12

  Online published: 2014-08-13

Abstract

This experiment was conducted to study the effects of three starch sources (corn, wheat flour and cassava starch) on pellet quality of extruded feed and apparent digestibility of dry matter,crude protein and gross energy of genetic improvement of farmed tilapia. Five diets were prepared by using 40% corn (group D1), 40% wheat flour (group D2), 40% cassava starch (group D3), 35% wheat flour+5% cassava starch (group D4) and 35% corn+5% cassava starch (group D5) as starch sources, respectively. Each diet was fed 4 replicates of 30 fish of an initial body weight of 95 g for 70 days. The results showed as follows: 1) the expansion (99.3%) and starch gelatinization (99.2%) in group D3 were significantly higher than those in other groups (P<0.05), and the bulk density and hardness were the lowest, correspondingly; the expansion (56.3%) and starch gelatinization (92.9%) in group D1 were significantly lower than those in other groups (P<0.05), and the bulk density and hardness were the highest, correspondingly. 2) The amylopectin content and expansion showed a positive correlation (y=-1.895x2+105.4x-1 341.4,R2=0.905), the expansion and bulk density showed a negative correlation (y=-0.62x+489.1,R12=0.737), the starch gelatinization and expansion showed a positive correlation (y=6.263x-525.9,R22=0.682), the expansion and hardness showed a negative correlation (y=-7.896x+5 238,R32=0.644). 3) The apparent digestibility of crude protein and gross energy in groups D2 and D4 was significantly higher than that in groups D1 and D2 (P<0.05), there were no difference in dry matter apparent digestibility among all groups (P>0.05). In the present study, 35% wheat flour+5% cassava starch as starch source has the best effect.

Cite this article

YUAN Jun, XUE Min, WU Lixin, WANG Jia, ZHENG Yinhua, WU Xiufeng, HAN Fang . Effects of Different Starch Sources on Pellet Quality of Extruded Feed and Apparent Digestibility of Genetic Improvement of Farmed Tilapia (Oreochromis niloticus,GIFT)[J]. Chinese Journal of Animal Nutrition, 2014 , 26(8) : 2209 -2216 . DOI: 10.3969/j.issn.1006-267x.2014.08.023

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