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Method for obtaining bovine zygotes produced in vivo
J E Ellington1, P B Farrell, M E Simkin
1Department of Animal Science, New York State College of Agriculture and Life Sciences, Cornell University, Ithaca 14853-4801.
American Journal of Veterinary Research
|November 1, 1990
Summary
Researchers developed a superovulation and surgical technique for collecting bovine zygotes. This method efficiently recovers embryos from both cows and heifers, offering valuable insights into bovine reproductive efficiency.
Area of Science:
- Reproductive Biology
- Veterinary Science
- Embryology
Background:
- Efficient recovery of bovine zygotes is crucial for assisted reproductive technologies.
- Existing protocols may have limitations in terms of efficacy and applicability to different bovine demographics (cows vs. heifers).
Purpose of the Study:
- To develop and evaluate a combined superovulatory and surgical protocol for bovine zygote recovery.
- To compare zygote recovery and fertility rates between Holstein cows and heifers.
Main Methods:
- Superovulation was induced using follicle-stimulating hormone and cloprostenol in Holstein cows and heifers.
- Surgical cannulation and lavage of the uterine tube were performed 40-48 hours post-estrus.
- Zygote recovery rates and fertility were assessed.
Main Results:
- Cows generally yielded more corpora hemorrhagica compared to heifers.
- A significantly higher percentage of ova recovered from cows were infertile (P < 0.05).
- Embryo recovery rates were equivalent in heifers undergoing the procedure twice.
Conclusions:
- The developed protocol is effective for bovine zygote recovery.
- Differences in fertility rates between cows and heifers warrant further investigation.
- The protocol demonstrates consistent embryo recovery rates in heifers upon repeated application.