Utilização de probióticos na alimentação de Kinguios (Carassius auratus)

Abstract

The present study aimed to evaluate the effect of using probiotics at the Kinguios’ diet in performance and transport stress. The experiment was carried out at the Animal Morphophysiology Laboratory/UFGD, Dourados/MS, lasting 74 days. 140 animals from commercial production were used, randomly distributed in 20 experimental units with 5L capacity at a density of 1.4 fish / liter. The feed provided 3x / day "ad libitum" until apparent satiety, where 4 different levels of probiotics in the diet were evaluated and a control (T1-0%; T2-0,5%; T3-1,0%; T4-1,5% e T5-2,0%). For water parameters, temperature, oxygen and pH were daily checked and siphoning performed with a 10% water change. For performance evaluation, initially, biometrics of 100% of the animals were performed, after which four biometrics were performed every 15 days and at the end of the experiment 100%, evaluating the performance by the difference of initial and final biometrics and calculated means by treatment using Sisvar statistical program, which showed no significant differences between treatments. As the probiotic acts mainly on the immune balance, a stress test was performed. For this, a standard transport was simulated, where oxygen was added in plastic bags, in the density of 2 animals per liter of water, two packages/repetitions per treatment. Then, a procedure was performed simulating transport for a few hours and returned back to the laboratory, still being kept in the packaging for the next analyzes. After 12 hours of the transport simulation, filming began to assess behavior. These last for 5 minutes each, with an interval of 4 hours, obtaining footage up to 44 hours of packaging. The results of which were analyzed by the Sisvar statistical program, and showed no significant difference between treatments, but within the grouping behavior there was a significant difference (P>0.05) within the groups (T1; T3; T4).