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Updated: Feb 26, 2026
09:30
In Vitro Culture Strategy for Oocytes from Early Antral Follicle in Cattle
Published on: July 8, 2020
9.6K
Steroid hormones regulate sperm-oviduct interactions in the bovine
Julie Lamy1, Emilie Corbin1, Marie-Claire Blache1
1Physiologie de la Reproduction et des Comportements (PRC)UMR85, INRA, CNRS, UFR, IFCE, Nouzilly, France.
Reproduction (Cambridge, England)
|July 22, 2017
Summary
Ovarian steroids regulate sperm reservoirs in cows. Estradiol (E2) affects sperm binding, while progesterone (P4) releases sperm, enhancing fertilization rates.
Area of Science:
- Reproductive Biology
- Endocrinology
- Animal Science
Background:
- Sperm reservoirs form in cow oviducts post-insemination for progressive sperm release.
- Hormonal regulation of sperm-oviduct interactions is crucial for fertilization.
Purpose of the Study:
- To investigate the in vitro effects of ovarian steroids (17β-estradiol and progesterone) on bovine oviduct epithelial cells (BOEC) and sperm binding/release.
Main Methods:
- BOEC monolayers were pretreated or co-incubated with varying concentrations of 17β-estradiol (E2) and progesterone (P4) with spermatozoa.
- Sperm binding and release from BOEC were quantified.
- Cleavage and blastocyst rates after in vitro fertilization were assessed.
Main Results:
- E2 pretreatment decreased sperm binding to BOEC in a dose-dependent manner.
- P4 induced significant release of bound spermatozoa from BOEC.
- E2 inhibited P4's sperm-releasing effect at higher concentrations.
- Sperm released by P4 action showed improved subsequent fertilization outcomes.
Conclusions:
- Dynamic changes in E2 and P4 regulate bovine sperm reservoir formation and timed sperm delivery.
- Steroid hormones play a key role in synchronizing sperm availability with ovulation.
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