Economic evaluation of prebiotics, probiotics and symbiotics in juvenile Nile tilapia

Rafael Vieira de Azevedo, João Carlos Fosse Filho, Leonardo Demier Cardoso, Douglas da Cruz Mattos, Manuel Vazquez Vidal Júnior, Dalcio Ricardo de Andrade

Resumo


This study aimed to evaluate economically the inclusion of prebiotics, probiotics and symbiotics in diets of Nile tilapia (4.07 ± 0.30 g), at two stocking densities (0.6 and 1.2 kg m-3). A total of 288 fish were distributed over 32 tanks (40 L) in a completely randomised design, in a 2 x 4 factorial (stocking density x additives), with four replications, over six weeks. The following were evaluated: total feed consumption (FC), final biomass (FB), relative gain in biomass (RGB), apparent feed conversion (AFC), survival rate (SUR), average cost of feed per kg of live weight gain (ACF), total cost of feed (TCF), total cost of production (TCP), gross income (GI), operating profit (OP) and economic efficiency index (EEI). No effect was seen on the evaluated parameters from the interaction (p>0.05) between stocking density and inclusion of the feed additives. No influence was observed (p>0.05) on SUR from the stocking density, although this significantly influenced the parameters FB, FC, RGB, AFC, ACF, TCF, TCP, GI and OP. There was no significant influence from the inclusion of prebiotics, probiotics and symbiotics on FC, SUR and TCF, however there was an influence (p<0.05) on the parameters FB, RGB, AFC, ACF, TCP, GI and OP. The control diet at the higher density displayed the worst EEI. The best EEI was obtained by fish at the lower density which received feed with added probiotics and symbiotics. The best indices of economic and zootechnical performance obtained demonstrate the economic viability of including prebiotics, probiotics and symbiotics in the diets of Nile tilapia.

Palavras-chave


Bacillus subtilis; Diets; Fish-feeding; Mannan oligosaccharides; Oreochromis niloticus

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Referências


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