Effects of dietary amylose and amylopectin ratio on growth performance and energetic metabolism of pacu juveniles

• Grant number: 15/08988-0
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• Effective date (Start): August 01, 2015
• Effective date (End): October 29, 2017
• Field of knowledge: Agronomical Sciences - Animal Husbandry - Animal Nutrition and Feeding
• Principal Investigator: Leonardo Susumu Takahashi
• Grantee: Amanda Miyuki Oshiro
• Host Institution: Faculdade de Ciências Agrárias e Tecnológicas. Universidade Estadual Paulista (UNESP). Campus de Dracena. Dracena , SP, Brazil
• Associated scholarship(s): 16/23712-4 - Chemical composition, analysis of digestive enzymatic activities, and of the structure and ultrastructure of the tissues of the digestive fish system in different diets, BE.EP.IC

Abstract

Proper inclusion of carbohydrate in fish diets for maximum utilization of dietary protein for growth is an interesting tool to reduce costs of production and nitrogen excretion. The relative use of dietary carbohydrates could be related to the structural characteristics of the starch. This study will evaluate the effect of different amounts of amylose and amylopectin in diets for juvenile pacu (Piaractus mesopotamicus) and its influence on growth performance and energetic metabolism of fish. The experiment will be conducted in a completely randomized design with six treatments and four replicates. Six experimental diets with vitamin and mineral premixture, 23% crude protein (21% PD estimated), 4000 kcal CE/kg of diet and 34% starch will be formulated. Different amounts of amylose / amylopectin will be provided by the inclusion of different amounts of regular corn starch (27.8% amylose, 72.2% amylopectin), waxy maize (1.8% amylose, amylopectin 98.2%) and high amylose corn starch (71% amylose and 29% amylopectin). After 90 days of feeding, will be evaluated growth performance, body composition and nutrient retention, blood metabolites and tissue energy reserves. The results will be submitted to ANOVA and means will be compared by Tukey's test (5%). (AU)