Some factors affect of embryo-flushing in dairy cattle

Abstract

The authors examined the factors affect of embryo-flushing (n=613) in field conditions. They searched interaction between age of donors (cow vs. heifer) and embryo quality and yield, sought correlation between the milk production of donors and the number of transferable embryos, degenerated embryos and oocytes. The other hand the effect of different kind of superovulation treatments on embryo production was examined. Results of the present study show that the age of donors was influenced for the efficiency of the embryo-flushing. Cow donors product significant (P<0.001) more eggs than heifers, but virgin heifers product better embryos than cows. Significant correlation (r= -0.26; P<0.01) was founded between milk production and embryo-quantity and there wasn’t correlation (r= 0.08) between milk production and flushed eggs (unfertilized oocytes and degenerate embryos). The treatment of superovulation determines the successfulness of ET.