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Multiple factors affecting superovulation in Poll Dorset in China
1College of Veterinary Medicine, Northwest University of Agriculture & Forestry, Yangling, Shaanxi 712100, China.
Reproduction in Domestic Animals = Zuchthygiene
|December 9, 2009
Summary
Optimizing Poll Dorset sheep breeding in China requires specific protocols. Using Canadian FSH (Folltropin-V) on multiparous ewes exhibiting natural estrus and normal corpus luteum function maximizes embryo recovery and transfer success.
Area of Science:
- Reproductive biology
- Animal science
- Sheep breeding
Background:
- Poll Dorset sheep are valuable for breeding programs.
- Imported genetics require efficient reproduction technologies.
- Multiple ovulation and embryo transfer (MOET) is key for flock expansion.
Purpose of the Study:
- To optimize superovulation and embryo transfer in Poll Dorset sheep.
- To evaluate factors affecting embryo yield and quality.
- To establish best practices for MOET in this breed.
Main Methods:
- Tested FSH from three manufacturers, including Canadian Folltropin-V (Ca-FSH).
- Compared nulliparous and multiparous ewes for superovulation.
- Assessed effects of repeated superovulation, induced vs. natural estrus, estrus delay, and corpus luteum status.
Main Results:
- Ca-FSH (160-200 mg) yielded 12.91 ± 7.80 embryos.
- Multiparous ewes significantly outperformed nulliparous ewes (p<0.05).
- Natural estrus and normal corpus luteum significantly increased embryo numbers (p<0.05).
- Estrus delay and corpus luteum regression reduced embryo yield (p<0.01).
Conclusions:
- Canadian FSH (Folltropin-V) is effective for Poll Dorset superovulation.
- Selecting multiparous ewes with natural estrus and normal corpus luteum is crucial.
- These factors optimize embryo collection and transfer success in sheep MOET programs.
