Two hundred and forty male chickens with weight means initial of 1204 g, were utilized and allocated according to a completely randomized design , with treatments arranged in a factorial scheme 2 x 3 x 2, 2 2 levels of KCl (0,0% and 1,2%) x 3 levels of NH4Cl (0,0%, 0,2% and 0,4%) x 2 levels of Metabolizable Energy (3000 and 3200 Kcal ME/kg of diets), with four replications with five broilers in each. The index of temperature of the black globe and humidity (ITGU) was observed at 9:00 and 15:00 hours which was of 76 and 83, respectively. There was a significant interaction (P <0,01) of KCl with NH4Cl for the surface temperature. The energetic level of diet (P <0.01) was affected by the surface temperature in the afternoon. The variables rectal temperature, respiratory frequency, pH of the blood and the performance were not significant effect (P>0,05) by the treatments studied. The water intake increased (P <0,05) with the addition of KCl in the diet. The feed conversion shown to be better (P <0,05) with the increasing the energy level in the diets and it was worse (P <0,05) at the highest level of chloride of ammonia added in the diets. There was significant interaction (P <0,05) between KCl and the energy level of the diets for feed intake. It was conclude that, studied factors do not affect any of the physiologics parameters studied as well as the broiler performance except for feed conversion that shown better with the by the increasing energy level of the diet and shown to be worse by the addition high level of chloride of ammonia in the diet.
metabolizabel energy; heat stress; ammonium chloride; broiler chicken; performance
