饲料蛋白质水平对大鳞鲃幼鱼消化酶活性的影响

Journal of Tianjin Agricultural University ›› 2012, Vol. 19 ›› Issue (3): 26-31.

• Researches and Scientific Notes • Previous Articles Next Articles

Effects of Different Dietary Protein Levels on Digestive Enzyme of Young Barbus capito

WANG Chang-an^1,2, XU Qi-you^{1,Corresponding Author}, XU Wei¹, XU Hong¹, ZHAO Zhi-gang¹, LUO Liang¹, MIAO Jian-fa³, WANG Yang¹

1. Heilongjiang River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Harbin 150070, China;
2. College of Wildlife Resources, Northeast Forestry University, Harbin 150040, China;
3. Tianjin Tianxiang Aquatic Company Limited, Tianjin 301500, China

Received:2012-05-04 Online:2012-09-20 Published:2019-11-12

Abstract

Abstract: This trial was conducted to determine the effects of different dietary protein levels on digestive enzyme of young Barbus capito at an average weight of 11.07±2.42 g. Formulated diets contain seven protein levels of 30.24% (G1), 33.22% (G2), 36.23% (G3), 39.33% (G4), 42.15% (G5), 45.33% (G6) and 48.12% (G7), respectively. Each diet was randomly assigned to triplicate groups of 30 fish. Fish were raised in recycling system for 56 days. The results show that the protease activities in foregut and midgut increased with the rise of dietary protein levels. The protease activity in foregut of G5 was significantly higher than that of G1 and G7 (P<0.05), respectively. The protease activity in midgut of G4 was significantly higher than that of G1, G6 and G7 (P<0.05), respectively. The protease activity in hindgut rose up and subsequently diminished with the increase of the dietary protein levels. There were no significant differences among the groups in lipase activities of foregut, midgut, hindgut and hepatopancreases (P>0.05). The amylase activity in foregut of G7 was significantly higher than that of G3 and G6 (P<0.05), respectively. The amylase activity in midgut of G7 was significantly higher than that of G1 and G4 (P<0.05), respectively. The amylase activity in hepatopancreases of G7 was significantly higher than that of G1, G2, G3 and G4 (P<0.05), respectively. In conclusion, the dietary protein levels affected the protease and amylase activities of young Barbus capito significantly, but there were no significant changes in lipase activities. The digestive enzyme activity reached the peak when the dietary protein level was 39.33%.

Key words: Barbus capito, protein, digestive enzyme

CLC Number:

S963.73

WANG Chang-an, XU Qi-you, XU Wei, XU Hong, ZHAO Zhi-gang, LUO Liang, MIAO Jian-fa, WANG Yang. Effects of Different Dietary Protein Levels on Digestive Enzyme of Young Barbus capito[J]. Journal of Tianjin Agricultural University, 2012, 19(3): 26-31.

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Effects of Different Dietary Protein Levels on Digestive Enzyme of Young Barbus capito

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