Abstract
One day old straight chicks ( Fawbro ) were used to study the effect of low light intensity during the hot hours on the day on some productive and physiological traits of broilers reared under high cyclic temperature ( 28-36-28 cْ ). Two treatments were used as follows ( T1) the birds were exposed to lower light intensity 0.5 -0.7 Lux for 12 hours during the hot period on the day (9 a.m. to 9 p.m . ) and followed by 15-16 Lux for 12 hours ( 9 p.m to9 a.m ) . ( T2) the birds were exposed for constant light intensity 15-16 Lux for 24 hours continuously . Result revealed low light intensity 0.5-0.7 Lux significantly ( p<0.05 ) increased the average of body weight at 8 weeks of age , quantity of consumption feed and total weight gain means during the period 4-8 weeks of age . as result revealed significantly decrease ( p<0.05) in mortality and Heterophils / Lymphocytes ( H / L ) ratio for low light intensity ( T1 ) compared with ( T2 ) that light intensity 15-16 Lux for 24 hr.
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