Growth performance and metabolic response of Nile tilapia fed rations supplemented with autolized yeast and zinc

Revista Brasileira de Zootecnia

Barros, Margarida Maria²  Pezzato, Luiz Edivaldo²  Padovani, Carlos Roberto²  Padilha, Pedro de Magalhães²  Signor, Altevir¹ 

[1] Unioeste;Unesp

关键词: fingerlings;    growth;    metabolism;    metabolites;    minerals RESUMO Avaliou-se a influência do uso de levedura e zinco no desempenho produtivo e no metabolismo de tilápiasdo-nilo;   

DOI  :  10.1590/S1516-35982010001200002

学科分类：兽医学

来源: Universidade Federal de Vicosa

【 摘 要 】

This research evaluated the influence of yeast and zinc on growth performance and metabolic responses of Nile tilapia. Diets were formulated to contain 32.0% digestible protein and 3,240 kcal DE/kg diet and the following autolized yeast (%):zinc (mg/kg)relationships: 0.0:0.0; 0.0:79.5; 2.0:0.0; 0.795:79.5; 2.0:200; 4.0:400; 6.0:600; 12.0:1,200 and 14.0:1,400. It was used 135 fingerlings (7.27 ± 0.19 g), distributed in a complete random design in 27 50-L aquaria and they were fed ad libitum four times a day for 128 days. It was evaluated growth performance and metabolic responses, weight gain, apparent feed conversion; protein efficiency and survival rate; percentage of protein, ether extract, dry weight and ashes in the muscle and in the bones; ammonia concentration and kinetic activity of alkaline phosphatase in the liver; ammonia, kinetic activity of alkaline phosphatase, urea and lipids in the plasma and; minerals in plasma, in the liver and in the bones of the fish. High levels of yeast and zinc in the diet impaired growth performance and metabolic responses of the fish. Autolized yeast at the level of 2.0% determines the best growth performance. Levels higher than 6.0% of autolized yeast and 600 mg zinc in the diets impair growth performance and lipid metabolism in fish and levels higher than 4.0% of autolized yeast and 400 mg zinc/kg in the diet impair mineral metabolism.

【 授权许可】

CC BY-NC