Uso de Bacillus subtilis e butirato de sódio para pintos de corte vacinados com diferentes cepas vacinais contra a doença de Newcastle

Abstract

This study was conducted to evaluate the effect of the use of Bacillus subtilis and sodium butyrate associated with the use antibotic growth promoting (AGP) conventionally (enramycin in subtherapeutic level) in broiler chicks, feed vaccinated with different strains (with tropism by intestine) of Newcastle disease on intestinal development and performance of broilers in the initial phase of rearing. The experiment was conducted in the poultry sector of the Federal University of Bahia Recôncavo (UFRB), used 864 broiler chicks, Cobb females with a day old and reared up to 21 days. It was adopted a completely randomized design in a 2x2 factorial design, with two diets (AGP conventional and one with addition of Bacillus subtilis and sodium butyrate as alternative additives balancers intestinal microbiota (AABIM) in association with Conventional AGP) and two live vaccine strains apathogenic against Newcastle disease (PHY.LMV.42 and Ulster), totaling four treatments, six replicates and 36 birds per repetition. There was no interaction (P> 0.05) between the different vaccine strains and the use of performance enhancing additives on the intestinal biometrics at 7, 14 and 21 days. The vaccinated group of birds with Ulster strain obtained length greater (P <0.05) on the jejunum after 7 days of rearing. At 21 days of creation, the length of the duodenum was higher (P <0.05) in birds fed diets containing jointly in feed additives (AGP and AABIM). It was observed greater villus height and absorption surface in the jejunum (P <0.05) from birds at 7 and 21 days of age were fed a diet with alternative additives (AABIM and AGP) and also reflected in the performance results found for the their ages. There was interaction (P <0.05) amonvvvvvvvvvvvvvg the factors studied for villi height of jejunum to 14 days and the results indicated that only the group of birds submitted to PHY.LMV.42 strain when fed diets containing alternative additives was increased to this variable. The results showed positive effect of using additives balancers intestinal microbiota used as an important tool in order to obtain the proper intestinal development and therefore better performance. The evaluated vaccine strains present in some degree different effects on intestinal development and this fact may imply different responses on performance in the early stages of creation and therefore demand further studies to evaluate this specific issue.