Effects of quantity and quality of dietary protein on certain enzyme activities in rainbow trout.

摘要: The effects of variation in quality and quantity dietary protein on certain tissue enzymes rainbow trout (Salmo gairdneri) were examined. Trout given for 9 weeks diets containing proteins different (fish-meal, casein corn gluten) with energy levels ranging from 26 to 74% total metabolizable energy. In the first experiment, activities a number monitored by only hepatic serine pyruvate transaminase (SPT) activity changed response treatments--increasing as level was raised. second opposing glycolytic an gluconeogenic enzyme [pyruvate kinase (PK) phosphoenolpyruvate carboxykinase (PEPCK); phosphofructokinase (PFK) fructose diphosphatase (FDP)] measured. Gluconeogenic correlated positively significantly level; negatively this parameter all three proteins. There no consistent relationship between presumed equilibrium point maximum weight gain It is suggested that SPT, PFK, PK, FDP PEPCK will provide useful indices status trout.