Avaliação de patos crioulos (Cairina moschata domesticus) em confinamento e alimentados com rações contendo diferentes granulometrias do milho

Abstract

The objective of this study was to determine the best granulometry of maize in rations for Creole ducks (Cairina moschata dosmesticus) in different confinement densities, besides the presumptive identification of enterobacteria of the gastrointestinal tract (GIT) of birds. Thus, an experiment was conducted in the poultry sector of the Faculty of Agrarian Sciences of the Federal University of Amazonas and the Laboratory of Bioactive Principles of Microbial Origin (FCA / UFAM). 240 ducks were used in the experiment. The design was completely randomized in a factorial scheme (2x2), being: density (2 and 3 birds / m2) and corn grain size (6 and 8 mm), with four replications per treatment. With one day of life, 16 birds were slaughtered for cervical dislocation to collect contents of the gastrointestinal tract and GI measurement, repeating the analyzes at 35, 70 and 90 days, and the same were repeated by birds of the mirror. The birds were evaluated weekly to determine the performance of animals and at 90 days, 32 birds were slaughtered to determine the carcass yield, cuts and viscera. Data were submitted to analysis of variance and averages compared by the Tukey test at 5%, by the SAS statistical program. The microbiological analysis was expressed in frequency of occurrence. At 90 days, birds housed in the highest density had better performance (p <0.01), for particle size there was no difference (p> 0.05) in weight gain. In the carcass yield, there was difference in slaughter weight (p <0.01), carcass yield and abdominal fat (p <0.05), in relation to the densities. There were significant differences (p <0.05) in the corn grain size of the rations for slaughter weight, carcass yield and abdominal fat, with a higher weight result when slaughtering birds fed with rations containing less corn grain size (6mm) which was also observed in the commercial viscera, chest, thigh, back and biometries of the chest and leg, thus obtaining the best results. The total number of bacteria isolated was 586, comprising all breeding phases. Ten species belonging to seven genera were identified. Creole ducks raised in the density of 3 birds / m2 and fed with lower corn particle size in the feed (6 mm) showed better performance. E. coli strains normally make up the normal microbiota in the gut of birds, however, birds with symptoms of bacterial infections were not observed.