Timing of preovulatory LH surge and ovulation in superovulated sheep are affected by follicular status at start of the FSH treatment

Reproduction in Domestic Animals = Zuchthygiene
A Veiga-LopezA Gonzalez-Bulnes

Abstract

The aims of this study were to evaluate the chronology of periovulatory events (oestrus behaviour, LH surge and ovulation) in 16 superovulated Manchega sheep and to determine whether follicular status at start of the FSH supply might affect their occurrence. Mean timing for onset of oestrus behaviour was detected at 28.1 +/- 0.7 h after sponge withdrawal; the preovulatory LH surge and ovulation started at 37.2 +/- 0.7 h and 65.4 +/- 0.7 h after progestagen withdrawal, respectively. The intervals between oestrus, LH surge and ovulation were affected by a high individual variability, which might be the cause for reported decreased efficiency in embryo production. Current results also addressed the role of follicular status at start of the superovulatory treatment on the preovulatory LH surge and the ovulation. The interval LH surge-ovulation was increased in ewes with a growing dominant follicle at starting the FSH treatment (32.3 +/- 0.9 vs 28.6 +/- 0.5 h, p < 0.05). The developmental stage of the largest follicle at starting the superovulatory treatment also affected occurrence of LH surge and ovulation; follicles in growing phase advanced the occurrence of the LH surge and ovulation when compared to decreasing follicles (33.0 ...Continue Reading

References

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Citations

Jul 7, 2007·Fertility and Sterility·Antonio Gonzalez-Bulnes, Almudena Veiga-Lopez
May 28, 2020·Animals : an Open Access Journal From MDPI·Zurisaday Santos-JimenezAntonio Gonzalez-Bulnes
Dec 28, 2018·Animals : an Open Access Journal From MDPI·Paula Martinez-RosAntonio Gonzalez-Bulnes

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