Digestibilidade nos nutrientes da ração e desempenho de frangos de corte alimentados com rações formuladas com milheto ou sorgo e suplementadas com enzimas

Abstract

The objective was to evaluate the inclusion of an enzyme complex in diets with different energy ingredients (corn, sorghum and millet) on performance of broiler chickens, digestibility of nutrients in feed and intestinal parameters. In the first experiment was conducted a performance test with 1,800 male broiler chicks of the Cobb that were distributed in a randomized block design with six treatments (diets with corn, millet or sorghum supplemented with enzyme complex) with five replicates and 60 chicks each. The variables were body weight, weight gain, feed conversion and feed intake. The results were submitted to ANOVA and means compared by contrasts. Difference between energy ingredients on the feed of broilers at 42 days of age (p <0.05), whereas diets containing sorghum showed the best result. The enzyme supplementation in diets formulated with corn increased weight gain and weight of broilers in the initial creation (p <0.05) and improved feed, total period of creation. In diets with millet or sorghum, the addition of the enzyme complex did not allow better performance. In experiment II, a metabolism trial were conducted (with 420 chicks) and a performance test until 42 days old (1,200 broiler chicks). The treatments were made with diets supplemented with sorghum or millet enzyme complex. The design used for the assay was completely randomized, with seven replicates of 15 birds each for the study and performance of the design was a randomized block with five replicates and 60 birds each. Were also conducted surveys of bacteria gramnegativas and counting the total number of aerobic microorganisms in the small intestine. Means were compared by contrasts and Kruskal-Wallis test applied to the bacteria. Enzyme supplementation did not affect the intestinal tract of chickens (p> 0.05) at 14 and 28 days old. At 14 days of age was observed (p <0.05) lower pH value for the gut with millet and diets supplemented with enzymes. In the diets with sorghum enzyme supplementation improved (p <0.05) the digestibility of dry matter, ether extract and nitrogen balance in diets and with millet, only the digestibility of ether extract. Feed conversion was observed (p <0.05) in the pre-starter ration supplemented with millet with enzymes. It is concluded that the use of complex enzyme (amylase, pectinase, beta-glucanase, pentosanase, cellulase, protease and phytase) improved performance in diets with corn and had positive effect on nutrient digestibility of diets with sorghum or millet. However, the complex did not provide a change in bacteria counts of coliforms and aerobic microorganisms.