INJECTION OF HATCHING EGGS WITH RETINOIC ACID AND ITS COMBINED EFFECT WITH CHEMERIN ON THE PRODUCTIVE CHARACTERISTICS OF BROILER CHICKENS
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Abstract
The study was conducted to stimulate Chemerin through in ovo injection of retinoic acid at different incubation days and to determine the combined effect of the acid on the productive traits of broiler chickens. 720 ROSS (308) eggs were used in the experiment, distributed into four treatments of 180 eggs per treatment, in the hatchery and field of the Animal Production Department, College of Agriculture, University of Anbar, for the period from 11/19/2024 to 1/22/2025. The experiment consisted of two stages: the hatching stage and the rearing stage, aiming to investigate the effect of retinoic acid injection on the productive characteristics of broiler chickens. The first treatment (T1) was considered the control treatment. The eggs were injected with 3 µL of distilled water into the amnion membrane on day 12 of incubation. (T2) The eggs were injected with 3 µL of retinoic acid into the amnion membrane on day 12 of incubation. (T3) The eggs were injected with 3 µL of retinoic acid into the amnion membrane on day 18 of incubation. (T4) The chicks were injected with 3 µL of retinoic acid on the first day of hatching in the neck. The results indicated a significant improvement (p≤0.05) in the weekly body weight in the sixth week for treatment (T3) compared to the treatments included in the experiment. A significant improvement (p≤0.05) was also observed in the weight gain for the total period (1-42) days for treatment T3 compared to the experimental treatments. The results also showed a significant improvement (p≤0.05) in the relative growth rate for the total duration of treatment (T3) compared to the rest of the experimental treatments. The results also showed a significant improvement (p≤0.05) in the feed consumption rate for the total duration of treatments (T1), (T3), and (T4) compared to treatment (T2). The results also showed no significant differences (p≤0.05) in the feed conversion ratio in the sixth week between the experimental treatments, while treatment (T1) recorded a significant deterioration in the total duration of the feed conversion ratio compared to the rest of the treatments. No significant differences were observed in the total mortality rate during the rearing period. It can be concluded that retinoic acid injection improved the condition of the chicks, and this contributed to enhancing the productive characteristics of broiler chickens.
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Copyright (c) 2025 Afif Wahish Shahada, Salwan Mahmoud Abdullatif (Author)
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