Influência ambiental no desempenho de frangos de corte em Campina Grande-Paraíba.

Abstract

The objective of this work is to measure the effects stemas of different systems of environmental conditioning on the behavin of cut chickens during the months of August and September/2002. Two hangars were used with different thermal conditioning: hangar with amianthus tilesand artificial ventilation system without painting (TAWP) and hangar with amianthus tiles and artificial ventilation system with white painting in the roof (TAPC). For the indices of temperature of the black globe and humidity (ITGU), thermal load of radiation (TLR) and relative humidity of the air (RH), and consequently on the acting of the cut chickens, appraised for the alive weight of the birds (AW), i win of daily weight (WDW), alimentary conversion (AC), mortality rate (MR) and medium age discount (MAD). The experimental phase, was accomplished at hangar of creation of cut chickens belonging to the Granja Santissimo LTDA., located in the district of Sao Jose da Mata in the municipal district of Campina Grande - PB, using 8800 birds of the lineage COBB, mixed lot with age of 19 days in I begin him/it of the experiment and 49 days of age, corresponding to the 30 days in the end of the experiment. The environmental indexes were daily measured, in intervals of two hours, of the 7 to the 17 hours, in the internal and e external areas of the experimental hangars. The results were analyzed statistically through Student's t- test at 1% probability, level tends in view that the same is recommended for comparison of averages in the conditions of this work. It was ended, based on the environmental thermal indexes, that the hangar TAPC presented the best results of ITGU, TLR and RH, whose values correspondents were, on average, 73,0 k, 462 Wm"2 and 67,2% and, based on the indexes of productive acting of the birds with relationship to the alive weight (AW), I win of daily weight (WDW), alimentary conversion (AC), mortality rate (UR) and medium age of discount (MAD) statistically there was not significant difference. The values of the indexes of acting of the birds were inside of the strips considered ideals for the creation of cut chickens in this area.