Responses of digestive enzymes of tambaqui (Colossoma macropomum) to dietary cornstarch changes and metabolic inferences
Autor: | C.F. Corrêa, Gilberto Moraes, Lucia Helena de Aguiar, L. M. Lundstedt |
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Rok vydání: | 2007 |
Předmět: |
Physiology
medicine.medical_treatment Tambaqui Biochemistry medicine Animals Aspartic Acid Endopeptidases Chymotrypsin Trypsin Amylase Food science Amino Acids Molecular Biology Triglycerides Protease biology Muscles Fishes Starch alpha-Glucosidases biology.organism_classification Diet Gastrointestinal Tract Glucose Liver Amylases Lipogenesis Digestive enzyme biology.protein Maltase Glycogen medicine.drug |
Zdroj: | Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology. 147:857-862 |
ISSN: | 1095-6433 |
Popis: | Digestive enzyme responses plus metabolic implications were studied in tambaqui (Colossoma macropomum) fed isoproteic diets containing 28% crude protein, 3300 kcal of gross energy/kg and different amounts of cornstarch (30, 40 and 50%). Amylase, maltase, acid protease, trypsin and chymotrypsin from the alimentary tract were assayed. Plasma, liver and white muscle metabolites were gauged to profile metabolism of the fish. The alimentary tract of tambaqui is compartmentalized morphologically and enzymatically. Amylase was present through the gut; acid protease was detected in stomach; maltase, trypsin and chymotrypsin were found in pyloric caeca and proximal and distal intestine sections. Increase of cornstarch levels from 40 to 50% in the diet resulted in an increase in amylase and maltase. Trypsin and chymotrypsin were unresponsive to starch levels. Acid protease follows the protein/carbohydrate ratio decrease. The increase of dietary cornstarch resulted in liver glycogenesis and the increase in plasma triglycerides is suggestive of lipogenesis. Digestive biochemical responses of tambaqui correlated with changes of feeding plus the analyses of metabolic profile are assumed as a tool for optimizing diet formulation and are a clue to other feeding optimizations for freshwater tropical species. |
Databáze: | OpenAIRE |
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