Document Type : Articles
Authors
Department of Animals Production, Collage of Agriculture, Tikrit University, Iraq
Abstract
This study was carried out in the sheep field of the Department of Animal Production / College of Agriculture - Tikrit University for a period from 25/10/2021 to 2/1/2022 (70 days), preceded by a 14-day preliminary period to acclimatize the lamb to concentrated feed. In the sixteenth month, Awassi lambs aged 4-5 months were used from local trade, the initial weight was adjusted (25.350 ± 2.25) kg, the experiment was divided into two periods (0-35 days, 36-70 days) respectively . Study The results of this study are as follows: There are significant differences in efficiency for the second, third fourth and treatments (P≤0.05) on the first treatment. food conversion. It was in those qualities. Adding a mixture of (Cr-Met and Zn-Met) led to a significant (P≤0.05) increase in insulin concentration over the rest of the treatments, while the first treatment recorded a significant (P≤0.05) increase in cortisol concentration in lambs’ blood over the rest of the treatments. Significantly (P≤0.05) the two treatments (T2 and T3) over the rest of the treatments in the concentration of thyroxine (TSH), and the addition of Cr-Met recorded a significant increase (P≤0.05) over the rest of the treatments in the concentration of thyroxine (T4). It was noticed a significant decrease (P≤0.05) in the treatments (T2, T3, T4) compared to the control treatment (T1) in the concentration of threonine (T3). The length of the treatment period and the interaction between the periods and the treatments had a significant effect on these characteristics.
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