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| Effects of Dietary Selenium on Digestion and Feed Conversion in Yellowcheek Carp Elopichthys bambusa |
| XU Youqing,LI Taiyuan,DING Zhaokun,XIANG Jianguo |
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Abstract A feeding trial was conducted to study the effects of dietary selenium-yeast additions on digestion and food conversion of yellowcheek carp Elopichthys bambusa juveniles cultured in a net cage of 2 m × 2 m × 2 .5 m at water temperature of 22 ~ 30 ℃ in 2010 .The 20 day old juveniles with initial body weight of (5 .82 ± 0 .06 ) g were fed diets supplemented with 0 ,0 .30 ,0 .60 ,0 .90 ,and 1 .20 mg of selenium-yeast per kg wet diet for 10 weeks .Significant effects of the dietary selenium-yeast additions were observed on the activities of amylase ,lipase and trypsin in the intestine as well as food conversion (P< 0 .05) .In the diet containing the optimal selenium-yeast of 0 .6 mg/kg wet diet ,the peak activities of intestinal amylase ,and trypsin were observed in Weeks 5 and 10 ,with weight gain rate of 337 .92% ± 35 .10% in Week 5 and 590 .94% ± 21 .28% in Week 10 ( P < 0 .05) ,specific grow th rate of 3 .97% ± 0 .21% in Week 5 and 2 .68% ± 0 .04% in Week 10 (P < 0 .05) ,and feed coefficient of (5 .45 ± 0 .20) in Week 10 .
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Received: 25 July 2013
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