The experiment was conducted in the hatchery of the Animal Production Department of the
Directorate of Agricultural Research in Slemani during the period from 1/10/2022 to 1/12/2022.
300 fertilized eggs of local Kurdish chicken (12, 13) were used in the experiment and were divided
into three groups so that their weight and dimensions were not significantly different between the
experimental treatments. The experiment was divided into three treatments, where the eggs of the
first treatment were incubated at a temperature of 37.7 °C, while the eggs of the second treatment
were incubated at a temperature of 38 °C, and the eggs of the last treatment were incubated at a
temperature of 36 °C. After hatching the eggs, the chicks were sexed, and the mortality rate and
quality of the chicks were calculated. There were no significant differences between the treatments
used in the percentage of live and dead chicks. , as it was found that there were no significant
differences in the percentage of chicks with dry and wet between the treatments used. It was found
that there were significant differences between the treatments in the sex ratio of chicks. The
percentage of male and female chicks in the first treatment was 23.1% and 14.8%, respectively.
As for the second treatment, the percentage of males and females was 24.7% and 7.7%,
respectively. In the third treatment, the percentage of males and females was 15.9% and 13.7%,
respectively. It does conclude that increasing or decreasing the incubation temperature affected the
chick sex, and did not affect the hatchability percentage and the chick quality. More studies are
needed to find the effect of incubation temperature on chick sex to use it as a method for sexing
chicks.