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Recent advances in the superovulation in cattle.
Reuben J Mapletoft1, Kristina Bennett Steward, Gregg P Adams
1Western College of Veterinary Medicine, University of Saskatchewan, Saskatoon, Saskatchewan, S7N 5B4, Canada. reuben.mapletoft@usask.ca
Reproduction, Nutrition, Development
|March 11, 2003
Summary
Reducing variability in cattle superovulation is key for embryo transfer success. New protocols using gonadotrophins, timed with follicular waves, improve response and allow flexible treatment schedules.
Area of Science:
- Veterinary Science
- Reproductive Biology
- Animal Science
Background:
- Superovulatory response variability poses challenges in cattle embryo transfer.
- Purified porcine pituitary extract (Folltropin-V) has been studied to mitigate this variability.
- Ovarian follicular status at treatment initiation is a primary source of response variation.
Purpose of the Study:
- To review studies on purified porcine pituitary extract for superovulation in cattle.
- To identify strategies for reducing variability in superovulatory responses.
- To explore new protocols for efficient and flexible gonadotrophin treatments.
Main Methods:
- Review of studies utilizing purified porcine pituitary extract (Folltropin-V).
- Analysis of data on initiating gonadotrophin treatments during follicular wave emergence.
- Evaluation of techniques to control follicular wave dynamics (e.g., ablation, estradiol/progesterone).
Main Results:
- Initiating gonadotrophin treatments at follicular wave emergence improves superovulatory response.
- Follicular ablation and hormonal treatments reduce variability associated with follicular development stage.
- New protocols enable convenient, estrus-independent gonadotrophin treatment initiation.
- Repeated superstimulation is feasible at regular intervals without compromising embryo production.
Conclusions:
- Optimizing treatment timing relative to follicular waves is crucial for consistent superovulation.
- Techniques controlling follicular dynamics enhance embryo transfer efficiency in cattle.
- Novel protocols offer flexibility and improve donor management for embryo production.