Genomic differentiation between swamp and river buffalo using a cattle high-density single nucleotide polymorphisms...

Area of Science:

• Animal Genetics
• Livestock Genomics
• Population Genetics

Background:

• Water buffalo (Bubalus bubalis) are vital livestock, with growing interest in intensive farming and milk production.
• Limited population genetics data and breeding programs hinder efficient water buffalo management.
• Understanding genetic diversity is crucial for optimizing breeding and conservation strategies.

Purpose of the Study:

• To evaluate the effectiveness of the Illumina BovineHD BeadChip for water buffalo population genetics.
• To assess its utility for pedigree control and identifying variants in production candidate genes.
• To determine its suitability for parentage and identity testing in water buffalo.

Main Methods:

• Utilized a commercial high-density single nucleotide polymorphisms (SNP) genotyping panel (Illumina BovineHD BeadChip).
• Analyzed 777,962 SNPs, identifying 20,479 polymorphic SNPs in water buffalo.
• Applied principal component analysis (PCA) to discern population structure and hybridization.

Main Results:

• Identified 20,479 polymorphic SNPs, with 357 located near candidate genes.
• PCA revealed distinct clusters for swamp, river, and admixed river buffalo populations.
• Demonstrated that 30-50 SNPs are sufficient for high-probability parentage exclusion and identity testing.

Conclusions:

• The BovineHD BeadChip is a suitable tool for water buffalo population genetics studies.
• This technology effectively assesses population structure, hybridization, and individual identity.
• Findings support the development of advanced breeding programs and genetic management for water buffalo.