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Summary The relationship between donor age in donor cows (n=165) and quality of embryos was examined in this study. According to their donor age, the Holstein donors were divided into three groups. In the first group there were 61 donors between 2-3 years old; in the second group, 28 donors between 4-5 years old; and in the third group, 76 donors between ≥6 years old. In the study, donor cow age were aff ected transferable embryos and total embryo numbers statistically significant (P 0.05). The transferable embryo rate in groups was found between 53.46-63.24% in the experiment. A significant correlation (r=0.142) was recorded, i.e. between donor age and transferable embryos; a significant correlation was recorded (r=-0.138), i.e. between donor age and total embryos.

The Determination of Relationship Between Age and the Quality of Embryo of Donor Cows