Effects of Quantity and Quality of Dietary Protein on Certain Enzyme Activities in Rainbow Trout
- 1 February 1981
- journal article
- research article
- Published by Elsevier BV in Journal of Nutrition
- Vol. 111 (2), 336-345
- https://doi.org/10.1093/jn/111.2.336
Abstract
The effects of variation in quality and quantity of dietary protein on certain tissue enzymes in rainbow trout (Salmo gairdneri) were examined. Trout were given for 9 weeks diets containing proteins of different quality (fishmeal, casein and corn gluten) and with protein energy levels ranging from 26 to 74% of total metabolizable energy. In the first experiment, activities of a number of enzymes were monitored but only hepatic serine pyruvate transaminase (SPT) activity changed in response to the dietary treatments—increasing as protein energy level was raised. In the second experiment, opposing glycolytic and gluconeogenic enzyme activities [pyruvate kinase (PK) and phosphoenolpyruvate carboxykinase (PEPCK); phosphofructokinase (PFK) and fructose diphosphatase (FDP)] were measured. Gluconeogenic enzyme activities correlated positively and significantly with dietary protein energy level; glycolytic enzymes correlated negatively and significantly with this parameter for all three proteins. There was no consistent relationship between presumed equilibrium point of opposing enzyme activities and maximum weight gain for the three proteins. It is suggested that hepatic activities of SPT, PFK, PK, FDP and PEPCK will provide useful indices of protein status in trout.Keywords
This publication has 24 references indexed in Scilit:
- Physiological EnergeticsPublished by Elsevier BV ,1979
- Tissue enzyme levels as indices of protein status in sheepBritish Journal of Nutrition, 1978
- The regulation of gluconeogenesis by diet and insulin in rainbow trout (Salmo gairdneri)British Journal of Nutrition, 1977
- Amino Acid Supplementation of Casein in Diets of Atlantic Salmon (Salmo salar) Fry and of Soybean Meal for Rainbow Trout (Salmo gairdneri) FingerlingsJournal of the Fisheries Research Board of Canada, 1975
- Quantitative Protein Requirements of Rainbow TroutThe Progressive Fish-Culturist, 1974
- Protein Nutrition in Fish-IVNIPPON SUISAN GAKKAISHI, 1973
- Reciprocal Induction and Repression of Serine Dehydratase and Phosphoglycerate Dehydrogenase by Proteins and Dietary‐Essential Amino Acids in Rat LiverJBIC Journal of Biological Inorganic Chemistry, 1973
- Studies on the nutrition of marine flatfish. The protein requirement of plaice (Pleuronectes platessa)British Journal of Nutrition, 1972
- Histidine Metabolism in Fish-VNIPPON SUISAN GAKKAISHI, 1970
- A Method For Determining the Nutritive Value of a Protein by its Effect on Liver ProteinBritish Journal of Nutrition, 1953