Substituição parcial da farinha de milho por sêmea de trigo e Bacillus amyloliquefaciens CECT 5940 em dietas de poedeiras: efeitos sobre o desempenho produtivo e económico.

Abstract

This study aimed to evaluate the partial replacement of cornmeal with ST, with or without Bacillus amyloliquefaciens CECT 5940, on the productive and economic performance of laying hens. In a completely randomized study design, laying hens were categorized into three groups, each consisting of 20 hens, with four replicates. Three treatments were allocated as follows: T1: basal diet; T2: basal diet with 20% of the cornmeal replaced by ST; and T3: a basal diet that included 20% ST plus B. amyloliquefaciens CECT 5940 at a concentration of 2.109 cfu/g, also replacing cornmeal. Data were analyzed using ANOVA and Tukey's test with a 5% significance level, using the SPSS program. The following production parameters were analyzed: live weight (LW), laying rate (LR), feed conversion per egg mass (FR/EW), feed conversion per dozen eggs (FR/dz), feed intake (RI), and viability (Vb). Feed costs, production cost per egg, production cost per ten eggs, gross revenue, gross value added, profitability index, contribution margins, and break-even point were considered for the economic analysis. The addition of B. amyloliquefaciens CECT 5940 (T3) significantly improved LR and FR/dz when compared to the ST diet without the probiotic (p<0.05) (T2). Regarding the economic evaluation, both T2 and T3 resulted in a significant reduction in production costs (p<0.05). Compared to (T1), partial replacement of corn flour with ST significantly reduced (p<0.05) gross revenue and the break-even point, while the profitability index significantly increased (p<0.05). The addition of B. amyloliquefaciens CECT 5940 to the ST diet significantly increased (p<0.05) gross value added, the profitability index, and contribution margins, and significantly reduced the break-even point (p<0.05) compared to the basal diet (T1). It was concluded that the inclusion of B. amyloliquefaciens CECT 5940 in diets containing 20% wheat bran can maintain productive performance and improve economic indicators compared to the basal diet.(TRADUÇAO NOSSA)