Tribulus terrestris na alimentação de alevinos de tilápia-do-nilo

Abstract

This work supplemented the Nile tilapia diet with Tribulus terrestris, at a concentration of 200 mg kg-¹, 400 mg kg-¹ and 600 mg kg-¹, and a control group 0 mg kg-¹ of T. terrestris, with three replicates per treatment. The experiment took place in a recirculation system with 12 water tanks of 2000 liters, where 15 fingerlings were housed with an average weight of 1.5g ± 0.47 per unit, for a period of 32 days. Enzymatic activities (AST, ALT, SOD, alkaline phosphatase and amylase), zootechnical performance, fish composition and histomorphometric analysis of muscle fibers were analyzed. For the zootechnical performance and the centesimal composition of the carcasses, there was no (p>0.05) between treatments; There was a difference (p<0.05) in the concentration of enzymes, the results demonstrate that T. terrestris had a positive effect by increasing the enzymatic activity of amylase and alkaline phosphatase at all inclusion levels of T. terrestris, for the enzyme superoxide dismutase (SOD) it was observed that the group supplementing with 200 mg kg-¹ had an increase in contrast to the animals that received the control diet; For catalase, the group supplementing with 600 mg kg-¹ was significant, with a marked reduction of this enzyme; ALT and AST aspartate levels were reduced in all T. terrestris supplement groups compared to the control group. In the histomorphometric analysis of the muscle tissue, there were differences (p<0.05) between the frequencies of observation of each class of muscle fiber, showing that all groups supplementing with T. terrestris had reduced muscle fiber diameter when compared to the control group. In this study, the hepatoprotective effect, positive effect on oxidative stress, improvements in amylase levels were evidenced, but for zootechnical performance apparently there are no improvements according to its use, as well as, it appears to have an inhibitory effect on muscle hypertrophy.