Breed-specific factors influence embryonic lipid composition: comparison between Jersey and Holstein
Luis Baldoceda1, Isabelle Gilbert1, Dominic Gagné1
1Laboratory of Functional Genomics of Early Embryonic Development, Centre de Recherche en Biologie de la Reproduction, Institut des Nutraceutiques et des Aliments Fonctionnels, Faculté des sciences de l'agriculture et de l'alimentation, Pavillon des services, Université Laval, Québec G1V 0A6, Canada.
Cattle embryo cryopreservation success varies by breed. Jersey embryos have more lipids and lower mitochondrial activity than Holstein embryos, impacting their survival potential after freezing.
Area of Science:
- Reproductive Biology
- Animal Science
- Biochemistry
Background:
- Embryo cryopreservation survival varies, potentially due to lipid accumulation and composition.
- In vitro culture affects lipid droplets in cattle embryos, but breed-specific impacts are unknown.
Purpose of the Study:
- To investigate breed differences in lipid metabolism and cryotolerance between Jersey and Holstein cattle embryos.
- To correlate embryonic lipid content with mitochondrial activity and gene expression.
Main Methods:
- Comparison of in vivo-collected Jersey and Holstein embryos.
- Analysis of embryo color, lipid droplet abundance, lipid composition, mitochondrial activity, and gene expression.
Main Results:
- Jersey embryos were darker with more lipid droplets than Holstein embryos, even under identical conditions.
- Higher lipid content in Jersey embryos correlated with lower mitochondrial activity.
- Differential gene expression related to lipid metabolism and distinct lipid profiles were observed between breeds.
Conclusions:
- Genetic background significantly influences embryonic lipid metabolism and storage in cattle.
- Breed-specific lipid profiles may explain differences in cryopreservation tolerance.
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