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Minimizing mortality of broiler with nonlinear formulation


In tropical climates the heat is one of the major constraints to production of broilers and is responsible for inducing a high mortality, especially in the finishing phase. Thus, the objective of this study was to compare the thermal conditioning early (TC) and feed formulation using dietary electrolytes (DE). Therefore, the electrolyte balance of the K+Na-Cl is set at 350 mEq / kg and electrolyte ratio (K + Cl) / Na) in the 3:1 nonlinear program PPFR ( . Will be housed in each experiment, 640 male chicks one day old, distributed in a factorial arrangement 2x2 (with and without TC and with and without DE), in a randomized design in 32 boxes (8 replicates per treatment ). Thus the birds to be fed during: (1) a traditional diet without TC, (2) traditional diet with TC, (3) applying the diet with and without TC electrolyte balance and (4) application of dietary electrolyte balance with TC. The thermal conditioning is performed on the fifth day old birds for 24 hours at 36 °C and only half of the batch (320 birds). After this period, all birds will be transferred to boxes of 1.5 x3m (20 birds / box), with the bed of wood shavings reused. Through the experiment 1 will be assessed the effects of chronic heat stress (6 hours at 32 °C) applied to the birds of 35-39° days old. In experiment 2 will be subject to a challenge by acute heat stress (6 hours at 36 °C) in birds at 38° days old. The experiments will be electronically monitored for temperature and humidity of the microclimate of the shed and the area/height of birds. Feed and water are provided ad libitum, even during periods of stress. Are measured performance data (weight gain, feed intake and feed conversion), the mortality rate, carcass characteristics of broilers, as well as studying the economic feasibility of the adoption of these strategies to minimize the effects of an environment adverse thermal. (AU)

Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
MM RODRIGUES; M GARCIA NETO; SHV PERRI; DG SANDRE; MJA FARIA JR; PM OLIVEIRA; MF PINTO; RP CASSIANO. Techniques to Minimize the Effects of Acute Heat Stress or Chronic in Broilers. Brazilian Journal of Poultry Science, v. 21, n. 3, p. -, 2019. Web of Science Citations: 0.

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