Abstract
This study was condluted find the effect of feed withdrawal and addition of potassium chloride in drinking water on decreasing the negative effect of heat stress on productive performance and some physiological parameters in broilers. Three handerants , one day old broilers hybrid ( Iraqi Faw Bro) were reared to 21 days under normal temperature . During the period started at 22 days of age till 56 days , the broilers were subjected to six treatments, these treatments were , first ; free feeding (control) ,second ; feed withdrawal , third ; addition 0.4% KCl in drinking water, fourth ; feed withdrawal + 0.4% KCl in water , fifth ; addition 0.6% KCl in water , and the sixth ; feed withdrawal + 0.6% KCl in water . All groups of broilers were reared during the experimental periods under rotational temp (26-37-26) ºC. Results of statistical analysis of treatments showed no significant effect on live body weight, weekly weight gain , feed intake , feed conversion ratio , relative growth rate , dressing percentage , mortality percent , and blood pH . However , results also indicated a significant (p ≤ 0.05) effect on behavior of feed and water intake as percentage of live body weight . Feed intake was decreased while water consumption increased during the mid day between ( 12 to 8 pm) , body temprichar was significantly decreased as effect by treatments . more over , a significant decrees in blood glucose was detected in all treatments as companied with control . Also significant differences between treatments were found in blood hemoglobin and PCV through the eight week of age .
