Desempenho zootécnico de tilápias do nilo alimentadas com ração suplementada com simbióticos

Abstract

This work aimed to evaluate the effects of the symbiotic on the zootechnical performance of Nile tilapia fingerlings with an average weight of 2.5 grams of initial weight. The experiment was carried out in the Aquaculture Area of the Aquaculture Engineering course at the Federal University of Grande Dourados (UFGD), lasted 53 days and the experimental design was completely randomized, containing five treatments and four replications. The diets were prepared with different levels of symbiotic inclusion (1.5; 3.0; 4.5; 6.0% of prebiotics and probiotics (50% of each)), in addition to a control diet, without the addition of the additive (0.0%). After the final biometrics, three animals were randomly selected and subsequently euthanized by sectioning the spinal cord. From these animals, the liver, intestine and visceral fat were removed. Liver and visceral fat were weighed to obtain mass (in grams), and the entire intestine was measured to obtain length (in centimeters). For these analyses, the following indexes were analyzed: visceral fat, intestinal quotient and hepatosomatic index. The other parameters analyzed were final weight, weight gain, total length, feed conversion, uniformity, protein efficiency rate, specific growth rate, relative weight gain and survival. residuals and meeting the assumptions, the ANOVA analysis was performed. There were no significant differences for any of the zootechnical performance variables between the different levels of symbiotic inclusion for tilapia fingerlings. More tests are recommended to define the indicated dose of the symbiotic for tilapias in this growth phase.