Effects of dietary carbohydrate sources on growth performance, immunity and glycometabolic enzyme activity ofRhynchocypris lagowskiiDybowski

We examined the effects of dietary carbohydrate sources on growth performance, digestive ability, immunity and glycometabolic enzyme activity ofRhynchocypris lagowskiiDybowski. The fish were fed with glucose, sucrose, dextrin and corn starch for 8 weeks. Final body weight, weight gain rate, specific growth rate, feed efficiency ratio and protein efficiency ratio were positively related to the complexity of carbohydrates in diet as were the levels of total antioxidant capacity, complement 3, protease, glutathione peroxidase, amylase, alkaline phosphatase, lysozyme, catalase, superoxide dismutase, fructose-1,6-bisphosphatase, hexokinase and pyruvate kinase. Malondialdehyde content, hepatic glycogen, glucose-6-phosphate dehydrogenase, hepatosomatic index, viscerosomatic index and crude lipid content were negatively related to the complexity of carbohydrates in diet. Therefore,Rhynchocypris lagowskiiDybowski fed with corn starch or dextrin showed positive effects in terms of growth, digestion and absorption, glycolysis, gluconeogenesis, antioxidant capacity and immunity than those fed with glucose or sucrose.

Automated summary

The study found that the dietary carbohydrate sources affected the growth performance, digestive ability, immunity and glycometabolic enzyme activity of Rhynchocypris lagowskii. Corn starch and dextrin had positive effects on growth, digestion and absorption, antioxidant capacity and immunity, while glucose and sucrose performed poorly in these aspects.