Journal
REPRODUCTION IN DOMESTIC ANIMALS
Volume 44, Issue 3, Pages 474-479Publisher
WILEY
DOI: 10.1111/j.1439-0531.2008.01133.x
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Funding
- Eutheria Foundation, Cross Plains, WI, USA
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Follicle blood flow, follicular-fluid and plasma hormone concentrations, and oocyte quality were studied 30 h after an ovulation-inducing hCG treatment when the pre-ovulatory follicle was 32 mm. Mares were grouped as positive (n = 16) and negative (n = 44) for hCG antibodies before the experimental hCG treatment. Percentage of the follicle wall with blood flow signals was less (p < 0.05) in the antibody positive group than in the negative group. The concentrations of follicular-fluid oestradiol and free IGF1, and plasma oestradiol were greater (p < 0.001), and follicular-fluid progesterone (p < 0.001) and plasma LH (p < 0.02) were less in the antibody-positive group than in the negative group. For recovered oocytes at 30 h (n = 37), the antibody-positive group had fewer (p < 0.001) mature (MII) oocytes than the antibody-negative group. Results were attributable to highly effective neutralization of the hCG in the antibody-positive group.
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