Two experiments will be conducted in order to compare the method of the hot blade beak trimming method with infrared radiation on the development and production parameters of three strains of laying hens. During the first experiment, the birds will be housed initially in avian brood in a commercial manner. Be used with 720 chicks a day old and from 5 weeks of age, 672 birds will be transferred to rearing poultry. Will adopted a completely randomized in a factorial 2 x 3 (2 x 3 techniques pecking lines), totaling six treatments: T1 - infrared beak trimming / Lohmann LSL, T2 - infrared beak trimming / Hy-Line W-36, T3 - infrared beak trimming / Lohmann Brown; T4 - hot blade beak trimming / Lohmann LSL; T5 - hot blade beak trimming / Hy-Line W-36, T6 - hot blade beak trimming / Lohmann Brown. In phase will create six replicates of 20 birds per experimental plot, already during the growing phase will be eight replicates of 14 birds per experimental plot. The beak trimming through infrared radiation will be held the first day in the hatchery, since the method with conventional hot blade beak trimming will occur on the seventhy day of life. The second beak trimming will be performed 10 weeks. During the experimental period will be evaluated parameters uniformity, feed intake, feed conversion, mortality and length of beak. The second experiment will comprise the production phase (18th to 42th weeks of age), where 576 birds were selected from the first experiment will be housed in commercial aviary. The birds will be distributed in a completely randomized in a factorial 2 x 3 with maintenance of the six treatments used in the previous experiment, but with 12 repetitions of eight birds per plot. The performance parameters are evaluated age at first egg, sexual maturity, feed consumption, egg production, egg weight, feed conversion, mortality and persistency of posture. To evaluate the quality characteristics of the eggs, the experiment will be divided into six periods of 28 days where they will be assessed the specific gravity, resistance to breakage of the shell, percentage of yolk, albumen, shell and Haugh unit. The data from both experiments will be subjected to analysis of variance using the tools of the program SISVAR, with the averages compared by Tukey test at 5%. The variables that do not show normal distribution will be transformed [(x + 0.5) ^ 0.5] for further analysis.
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