Probiótico para tilápia nilótica em ambiente de desafio

Abstract

The use of probiotics has been an alternative to maximize animal performance by improving intestinal conditions for the processes of digestion and absorption of nutrients. Thus, the present study aimed to evaluate the inclusion of the probiotic for juveniles of Nile tilapia (Oreochromis niloticus) in a challenging environment (8 and 16 hours without water recirculation), under zootechnical and water quality parameters. The experiment was conducted at the Laboratory of Nutrition and Production of Ornamental Species (LNPEO) of the Federal Institute of Espirito Santo campus Alegre, lasting 50 days. Four levels of probiotic inclusion in the diet (0; 0.2; 0.4 and 0.6 grams of probiotic per kg of feed) were tested in two health challenges. The performance parameters evaluated were Weight gain (g), Feed consumption (g of feed consumed per experimental unit), Apparent Feed Conversion (g / g), Specific Growth Rate (% / day), Condition Factor, Rate protein efficiency (%) and energy efficiency rate (%) and also hepatosomatic index and survival rate. The levels of inclusion of the probiotic in the feed provided influence on the zootechnical parameters studied for the tested challenges. Among the parameters evaluated, it can be concluded that the recommended probiotic (Bacillus cereus var.toyol 4x1012 UFC e Bacillus subtilis 4x 1012) level varies depending on the challenge tested. Thus, for the 8-hour challenge 0.3246 g / kg of probiotic in the feed is recommended and for the 16-hour challenge in order to improve the survival rate of the animals, 0.331 g / kg of probiotic in the feed is recommended.