Abstract

This study was conducted in one of the laying hen farms in Al-Kifl district over two periods: 1-11-2022 until 31-12-2022 and then from 1-7-2023 until 30-8-2023. In the two periods, the flock of Asia Brown laying hens (during the winter, 4400 laying Isa-Brownes hens were used and in the summer, 4160 laying hens Isa-Browne were used) were used, aged between 34-41 week. The outcomes of the study indicated that there was a remarkable increase in the characteristics of production performance (egg production rate, HD, feed consumption, percentage of broken eggs, liveability, and egg weight) during winter as opposed to summer. In addition, the majority of physiological conditions (red and white blood cell count, hematocrit, glucose, cholesterol and triglycerides) were better in winter than in summer.