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Chromosomal abnormalities in bovine embryos and their influence on development
S J Kawarsky1, P K Basrur, R B Stubbings
1Department of Biomedical Sciences, University of Guelph, Ontario, Canada.
Biology of Reproduction
|January 1, 1996
Summary
Embryo cell numbers reveal that chromosomal abnormalities significantly slow development. Diploid and mixoploid embryos show the fastest growth, while haploid and polyploid embryos develop slowest.
Area of Science:
- Reproductive Biology
- Cytogenetics
- Animal Science
Background:
- In vitro maturation of bovine oocytes is a key technique in assisted reproduction.
- Semen from bulls with chromosomal abnormalities, such as Robertsonian translocations, can impact embryo development.
- Understanding the relationship between embryo karyotype and developmental potential is crucial for improving reproductive outcomes.
Purpose of the Study:
- To investigate the correlation between chromosome composition and early embryo development in cattle.
- To assess the impact of a Robertsonian translocation carrier bull on embryo quality and chromosomal makeup.
Main Methods:
- Bovine cumulus-oocyte complexes were matured in vitro and fertilized with semen from three bulls, including a 1/29 Robertsonian translocation carrier.
- Embryos were analyzed for sperm penetration, cleavage, and developmental rates at Day 2 and Day 5 post-insemination.
- Karyotyping and cell counting were performed on Day 5 embryos to assess chromosomal composition and developmental stage.
Main Results:
- No significant differences were observed in sperm penetration, cleavage, or early developmental rates among the bulls.
- On Day 5, embryo cell numbers varied significantly based on chromosomal composition: diploids (30.0 +/- 1.7), mixoploids (23.4 +/- 4.0), aneuploids (16.8 +/- 4.3), and haploids/polyploids (7.9 +/- 6.0).
- Chromosomal abnormalities were associated with a significant reduction in embryo growth rate (p < 0.001).
Conclusions:
- Embryo development rates, indicated by cell numbers, are slowest in haploid and polyploid embryos.
- Aneuploid embryos exhibited intermediate development, while mixoploid and diploid embryos showed the fastest development.
- Chromosomal normalcy is essential for optimal early embryo development in cattle.
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