The pattern of superovulatory oestrus and its influence on quantity and quality of embryos in prostaglandin Fzu and syncromate-B synchronized and folltropin in treated cows*

Abstract

The superovulatory oestrus was induced with PGF2 alpha in group 1 (n-8) and with syncromate-B in group 2 (n - 8). The perovulation was induced with folltropin - V. The embryos were collected nonsurgically on day 7 of post superovulatory oestrus. The onset, duration and intensity of superovulatory oestrus were studied in both the groups. 5MB treated cows exhibited early onset, shorter duration and poor intensity of superovulatory oestrus than PGF p treated cows. The number of ovulations, total embryos and transferable embryos were signiticantly (P <0.01) higher in group 1 than in 2. The onset and duration of superovulatory oestrus were positively correlated with nontransferable embryos in group 1 and negatively correlated in group 2. Though, the onset and duration of superovulatory oestrus have positive correlation with number of ovulations, total embryo and transferable embryos in both the groups, the relationship was weaker in group 2 and stronger in group 1. In both the groups, cows which have exhibited intense superovulatory oestrus produced more number of ovulations, total emb~yos and transferable embryos than in cows that exhibited moderate and weak superovulatory oestrus, It is inferred from this study that 5MB induced early onset, shorter duration and poor intensity ofsuperovulatory oestrus and this pattern of superovulatory oestrus decreased the ovarian response, total embryos and transferable embryos and increased the nontransferable embryos in cows.