Effect of pelleting and addition of enzymes and vitamins on the performance and advantage of energy and nutrients in broiler chickens from 1 to 21 days old

It was carried out an experiment to evaluate the effect of pelleting and addition of enzymes and vitamins on the performance and advantage of energy and nutrients in broiler chickens from 1 to 21 days old. A total of 350 broiler chickens, COBB, males, were used ( (47g +/- 2.5g) in a completely randoinized design, with the treatments in a 3 x 2 factorial arrangement (three diets with or without enzymes) and (two diets based on corn and soybean one meal two pelleted, with or without addition of vitamins and minerals after pelleting and the other with addition of vitamins and minerals before pelleting. The time and temperature of pelleting ranged from 5 to 9 minutes and 58 degrees C to 62 degrees C, respectively. After this process, the pelleted rations were around with the same particle size similar to meal rations. In the performance assay were utilized 10 replicates and the of metabolism assay it was with 5 replicates in each treatment with density of 5 chickens per plot (cage). The diets were formulated with 95% of the nutritional recommendations and the chickens were fed with in a feed restriction of 10% from ad libitum intake, which was calculated daily from the average intake of a group of chickens control, which were submitted to ad libitum intake of a diet formulated with 100% of the nutritional levels recommended. The enzyme complex utilized was Allzyme Vegpro (R), containing the enzymes protease, amylase and cellulase, which were added to the treatments following the manufacturer's recommendations, of 0.5 kg per ton of ration. At final of 21 days old, weight gain and feed conversion were evaluated. The excreta were collected by the methodology of total collection in the 20, 21 and 22 days to determination of the energetics values of the diets and as well as the ether extract and protein digestibility coefficients. The weight gain, feed conversion, corrected apparent metabolizable energy and coefficient of digestibility of ether extract showed a significant interaction (P < 0.01) between diets and enzymes, where the pelleted diet with enzyme and with addition of vitamins and minerals before pelleting presented better performance. Thee coefficient of digestibility of crude protein (CDCP), there was no interaction (P > 0.05) between diet and enzyme. There was a significant effect (P < 0.05) of the diets on CDCP. There was a significant difference (P < 0.05) in relation to the addition of enzymes in the diets. It was concluded that in pelleted rations with addition of vitamins and minerals before pelleting process, showed better chickens performance as well as better coefficients of digestibility of crude protein, ether extract and corrected apparent metabolizable energy of rations of broiler chickens from 1 to 21 days old.