The effect of Nano or non-Nano zinc oxide dosing on local Awassi Ewes on some productive and reproductive traits

الملخص

      This experiment was conducted in a field with a breeder (private sector) in Wasit Governorate / Kut District for the period from 1/7/2021 until 1/5/2022. 50 pregnant local Awassi ewes, 3-4 years old, were used in this experiment in order to study the effect of (nZno) dosing. Or (Zno) for local Awassi ewes in some productive and reproductive traits. The ewes were divided into 5 groups, A control group and four treatments, each group includes 10 ewes. The first group represents the control group without any additives. The first treatment dosed ewes with 40 mg/animal/day Zno, the second treatment was 20 mg/animal/day nZno, the third treatment was 60 mg/animal/day Zno, and the fourth treatment was 30 mg. /animal/day nZno. The ewes were dosed with zinc capsules at the beginning of the fourth month of pregnancy on 1/10/2021 until 30/11/2021. The results of this study showed that there were no significant differences in the weight of the ewes for the control group and the first, second, third and fourth treatments at breeding, and at the fourth and fifth months of  Pregnancy, birth, and the first three months after birth , A significant increase (P≤0.05) was observed in the birth rate of Awassi ewes according to the different treatments studied, as the birth rate reached its maximum in treatment (2) at 100%, while it was lowest in treatment (1) and the control group, reaching 80% for each of them. Respectively, there were no significant differences between the four treatments and the control group in the percentage of ewe deaths, as it amounted to 0.00% for all treatments and the control group. There were highly significant differences (P≤0.01) between the studied treatments in the percentage of twins, as it amounted to 0.00, 12.5, and 11.1., 0.00, 0.00%, respectively, as the treatments (3.2) recorded the highest percentage of twins, at (12.5, 11.1) %, respectively, and the lowest percentage for the treatments (4, 1) and the control group, as it amounted to (0.00) % for each of them.