Abstract:

In order to establish the core group of the purebred Wagyu and maximize their reproductive potential, which from three typical regions in south and north have been superovulated using the method of CIDR+FSH+PG, to explore the reasonable number of repeated superovulation and applied status in the different environment. The results showed that: the experiment of high strength repeated superovulation showed that the most of the transferable embryos have been recovered in the first superovulation, the increased superovulated times have a negative influence on the number of transferable embryos, however, the influence was not significant (P>0.05); there were no significant differences among different regions for the transferable embryos (7.38±4.27, 7.88±5.95, 7.45±5.24, P>0.05). In good breeding management, the suitable number of superovulation times were 3 to 4 when the interval was 1 month for high strength repeated super ovulation. The conventional superovulated program, which have 1 to 2 months interval and 3 times could be used to establish the core group of purebred Wagyu in our country.