Eficiência de sistemas evaporativos e dos níveis de energia na ração no desempenho de frangos de corte em crescimento

Abstract

Two aviary sheds were used, the shed 1 (AECS) equipped with an adiabatic evaporative cooling system and the shed 2 (AECS + ESPB) equipped with an adiabatic evaporative cooing system together with an evaporative system of perforated bricks in the front and side of the shed. The temperature and the relative humidity ofthe air were assessed with automated devices (datalogger), together with the Environmental Thermai index of Productivity for meat chicken (ET1Pmc). Nine hundred and sixty male chickens from the Cobb strain were used, fed with isoproteic diets, except for the energy leveis, which varied from 3,100 to 3,400 kcal. The use ofthe AECS was more efficient when associated to the ESPB. The AECS + ESPB provided a more comfortable and homogeneous environment, reflected on the productive parameters and favoring food conversion. Although the sheds exhibited moderateiy comfortable environments, according to the ETIPmc obtained, the AECS + ESPB showed a better balance ofthe environmental conditions between the sessions. The energy leveis did not influence the variables analyzed, with the exception ofthe deposition of abdominal fat.