Abstract

     Two experiments were carried out in the winter and summer seasons during the period from 2/7/2019 to 12/8/2019 and from 1/12/2019 to 12/1/2020 in the private barn belonging to the farmer Hamdi Al-Zailai in the village of Al-Fayoush, Tibn M/ Lahj District. In this study, 240 one-day-old Ross broilers were used, with 120 asexual broilers for each experiment. Broilers were randomly distributed to four replicates of equal area (1 x 3 = 3 m²), with a number of 30 broilers for each replicate.
      The results of this study showed that the season had a highly significant effect (P<0.01) on body weight and feed consumption rates in winter and summer, which reached 996.68, 1464.1 g, 785.93, 1201.35 g at four weeks of age, respectively,and 2031,33 , 3625 .55, 88,1324, and 65.2705 g at 6 weeks of age, respectively. The results also showed that the season had a highly significant effect (P<0.01) on the productivity rate per square meter of live weight, while the results showed a significant decrease (P<0.05) for the effect of the season in the characteristic of the feed conversion factor at 4 and 6 weeks, and in the mortality rate at 6 weeks of age.
     The correlation coefficient between the age of the broiler and its weekly weight was 0.98 and 0.99 in the winter and summer seasons, respectively, while the correlation coefficient between the average temperature and the rate of weekly feed consumption in the winter and summer seasons was 0.42 and 0.94 respectively.