Effects of 0rganic Zinc high Levels in Japanese quail female diets on some serum blood hormones

The Study was conducted in College of Agriculture (University of Anbar) Quail field to study the following traits: growth hormone, T3, T4, and T.S.H. A total of 180 female Japanese quail, aged 90 days and raised in cages, were randomly distributed across 4 nutritional treatments in a completely randomized design. Each treatment included 45 females, with three replicates per treatment, and each replicate contained 15 females, which were raised separately. The birds (females) were fed four types of diets representing the experimental treatments as follows: T1: the basal diet without added zinc, T2: the basal diet with the addition of 25 mg/kg of zinc, T3: the basal diet with the addition of 50 mg/kg of zinc, and T4: the basal diet with the addition of 75 mg/kg of zinc.The results indicated a significant increase at the (P ≤ 0.0001) level in the concentration of Growth Hormone (GH) in the blood serum at the 25 and 50 mg/kg zinc levels. A significant increase was also observed at the (P ≤ 0.0002) level in the concentration of Triiodothyronine (T3) at the 25 and 50 mg/kg zinc levels. Additionally, the results showed a significant increase at the (P ≤ 0.0025) level in the concentration of Tetraiodothyronine (T4) at the 25 mg/kg zinc level. There was also a significant increase at the (P ≤ 0.0001) level in the concentration of Thyroid-Stimulating Hormone (TSH) at the 25 and 50 mg/kg zinc levels compared to the control group.