Prebióticos, probióticos y tomillo (Thymus vulgaris) para pollo de engorde: rendimiento, características de la canal y variables sanguíneas↓Prebióticos, probióticos tomilho (Thymus vulgaris) para frangos de corte: desempenho, características da carca?a e variáveis sanguíneas

摘要

Background: a stressful environment predisposes broilers to various diseases. Probiotics, prebiotics and essential oils can be used as an alternative to antibiotics in poultry production. Objective: to evaluate the effects of the Fermacto (prebiotic), Bioplus 2B (probiotic), and thyme essential oil on growth, organ and carcass traits, and hematology of Ross broiler chicks during 42 days. Methods: broilers (n=140) were randomly assigned to seven dietary treatment groups with 20 broilers in each group. The experiment was repeated four times; hence, a total of 560 broilers were used in the study. The diets contained 1 or 2 g/kg Fermacto, 1 or 2 g/kg Bioplus 2B, and 0.5 or 1 g/kg thyme essential oil. A negative control was also included. Results: when compared with the control group, Fermacto, Bioplus 2B, and thyme essential oil resulted in an increase in body weight gain (BWG) and feed intake (FI), while feed conversion ratio (FCR) was enhanced by 2 g/kg Fermacto. Although thyme essential oil at 1 g/kg also improved FCR, it led to a reduction in the relative weight of thighs and wings. Limited differences were observed in blood parameters. Conclusion: Fermacto, Bioplus 2B, and thyme essential oil improved the average daily gain of broilers and had a limited effect on carcass, organs and plasma constituents.