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The genetic structure and diversity of smallholder dairy cattle in Rwanda
Oluyinka Opoola1,2, Felicien Shumbusho3, Innocent Rwamuhizi3
1Global Academy of Agriculture and Food Systems (GAAFS) and the Royal (Dick) School of Veterinary Studies (RDSVS), University of Edinburgh, Easter Bush Campus, Edinburgh, UK. yinkaelsie@yahoo.com.
BMC Genomic Data
|May 27, 2025
Summary
Rwanda's cattle genetic diversity is highly admixed, revealing significant contributions from European and African breeds. This diversity offers opportunities for targeted breed improvement programs to enhance dairy farming in Rwanda.
Area of Science:
- Animal Genetics
- Population Genomics
- Dairy Science
Background:
- Genomic characterization in Rwanda primarily focused on the Girinka program.
- Smallholder farmers benefit from diverse livestock initiatives beyond Girinka.
- Documenting genetic diversity is crucial for supporting Rwanda's dairy development.
Purpose of the Study:
- To assess the genetic structure and diversity of Rwanda's cattle population.
- To identify genetic contributions from various indigenous and exotic breeds.
- To explore potential genetic variations for targeted breed improvement.
Main Methods:
- Genotyping of 2,229 crossbred cattle using Bovine 50K and 100K arrays.
- Quality control and curation of genomic data for population analyses.
- Application of Principal Component Analysis (PCA), admixture analysis, heterozygosity, ROH, and MAF calculations.
Main Results:
- Rwanda cattle exhibit high admixture, with significant Holstein-Friesian (42%), Jersey (30%), and African breeds (28%) ancestries.
- Average Minor Allelic Frequency (MAF) was 33%, with high heterozygosity (0.41).
- Novel genes under selection associated with fertility, immunity, and adaptation were identified.
Conclusions:
- Rwanda's cattle population possesses rich genetic diversity from admixed ancestries.
- This diversity presents opportunities for breed improvement focusing on adaptation, disease resistance, and productivity.
- Genomic insights can guide short- and long-term strategies for smallholder dairy systems in Rwanda.
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