Superovulatory response in lactating cows with different follicular dynamics

Zentralblatt für Veterinärmedizin. Reihe A
M MacielH Rodriguez-Martinez

Abstract

To determine the influence of a dominant follicle on the superovulatory response in midlate lactating cows, the dynamics of follicular growth and the development of corpora lutea and embryos were studied. Real-time B-mode ultrasonography with a 7.5 MHz rectal linear-array transducer was used to scan the ovaries daily, from 8-12 days before superovulation until day 7 post-estrus, when embryos were recovered. On the first day of superovulation cows were classified as belonging to either a 'dominant' group (n = 12) having a 'dominant follicle', i.e. > 9 mm in diameter in growing phase or stable for < 4 days, or a 'non-dominant' group (n = 11) those carrying a 'non-dominant follicle', i.e. a follicle in a regressing phase or with the same diameter for > 4 days. Cows in the 'dominant' group had significantly higher numbers of 4-6 and 7-10 mm follicles than cows in the 'non-dominant' group on the third and the fifth day of superovulation. The total number of follicles (> 4 mm) preovulation and the number of CL day 7 postovulation was higher in the 'dominant' group than in the 'non-dominant' group. There were no differences between groups regarding the total number of embryos or transferable embryos recovered. The results indicate tha...Continue Reading

References

Jan 1, 1991·Journal of Reproduction and Fertility·L A GuilbaultP Matton
Sep 1, 1989·Journal of Reproduction and Fertility·O J GintherJ P Kastelic
Jul 1, 1988·Journal of Reproduction and Fertility·J D SavioJ F Roche
Oct 1, 1983·Theriogenology·G M Lindner, R W Wright
Mar 1, 1984·Theriogenology·R A Pierson, O J Ginther

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