Related Experiment Video
Updated: Jul 10, 2026
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In Vitro Culture Strategy for Oocytes from Early Antral Follicle in Cattle
Published on: July 8, 2020
Alternative approaches to setting up donor cows for superstimulation.
G A Bó1, D C Guerrero, G P Adams
1Instituto de Reproducción Animal Córdoba (IRAC), JL de Cabrera 106, X5000GVD, Córdoba, Argentina. gabrielbo@iracbiogen.com.ar
Theriogenology
|October 24, 2007
Summary
Alternative methods for synchronizing ovulation in cattle are needed, as estradiol is not widely available. Researchers are exploring new treatments to improve superstimulation protocols for embryo transfer in donor cows.
Area of Science:
- Reproductive endocrinology in livestock
- Embryo transfer technologies
- Veterinary science
Background:
- Controlled follicular wave emergence and ovulation protocols are crucial for on-farm embryo transfer.
- Estradiol-based synchronization methods are common but restricted in many countries.
- Existing alternatives like follicle aspiration and GnRH/pLH treatments have limitations for field application.
Purpose of the Study:
- To explore and evaluate alternative protocols for synchronizing follicular wave emergence and ovulation in donor cows.
- To identify methods that overcome the limitations of current estradiol-based synchronization protocols.
- To ensure efficient superstimulation treatments regardless of the donor cow's estrous cycle stage.
Main Methods:
- Investigating mechanical dominant follicle removal (follicle aspiration).
- Evaluating exogenous gonadotropin-releasing hormone (GnRH) or pregnant mare serum gonadotropin (PMSG/eCG) treatments.
- Exploring FSH or eCG to initiate follicular waves irrespective of dominant follicle presence.
- Assessing treatments initiated at the emergence of the first follicular wave.
Main Results:
- Estradiol synchronization is effective but not universally applicable.
- Follicle aspiration requires specialized equipment and expertise.
- GnRH/pLH efficacy depends on dominant follicle stage, leading to variable wave emergence.
- Initiating treatments without regard to dominant follicle presence (FSH/eCG) shows promise.
Conclusions:
- Alternative synchronization protocols are essential for widespread on-farm embryo transfer.
- Further research is needed to validate novel methods using FSH or eCG for superstimulation.
- The goal is to achieve reliable superstimulation regardless of the estrous cycle stage without compromising embryo yield.
