This study was designed to evaluate the impact of strain, thermal manipulations during incubation on the hatching traits and physiological body reactions of Dokii-4 and Golden Montazah chickens. A total of 2250 fertile eggs of both Golden Montazah and Dokii-4 eggs (2 strains × 3 treatments × 3 replicates × 125 eggs). The eggs of both strains were classified into 3 equal thermal treatments. All eggs were incubated at 37.5°C and 55-60 % RH during the period from one day till hatch (control group), while those in the 2^nd and 3^rd groups were daily exposed to 40ºC and  35 for 3 hours during 3 successive days from 5 to 7 day of incubation. During the last three days of incubation, eggs were incurred daily to 37°C and 60-65% RH. The obtained results showed that the hatchability of Golden Montazah was significantly decreased, while CWH (g) was significantly increased compared with Dokii-4 chickens. Regarding the effect of thermal manipulations, the highest hatchability (%) was recorded at 35°C and 37.5°C groups, while the lowest one was recorded at 40°C. The chick weight at hatch in the 1^st (37.5°C) and 3^rd (35°C) groups significantly increased than those in the 2^nd group (40°C) groups. It could be concluded that the hatchability and chick weight at hatch for Golden Montazah chickens produced from eggs exposed to normal and low incubation temperatures significantly improved compared with those under high incubation temperature group.