Detecting genetic regions associated with height in the native ponies of the British Isles by using high density SNP genotyping.

This research investigates the genetic factors that influence the height of native British ponies through high-density SNP genotyping, identifying various significant associations.

Objective of the Study

• The primary aim of the study was to map Quantitative Trait Loci (QTL) data associated with height, specifically at the withers (shoulder area), in four native breeds of ponies in the British Isles. This included dissecting two different subtypes of Welsh Cobs.

Methodology

• The research used a genome-wide analysis method, deploying an Illumina EquineSNP50 Infinium BeadChip. This technology is a type of microarray used to detect SNP (Single-Nucleotide Polymorphism) genotypes.
• 105 individual ponies and cobs were used in the study, which is likely to give a representative sample of the local breeds.

Findings

• The study found 222 highly significant SNPs (with a p-value of ≤ 10) relating to height in the samples.
• Of these 222 SNPs, three which reside on ECA9, a particular equine chromosome, have been previously reported in other studies, confirming their importance.
• The research discovered that the highest number of SNPs correlating with height in native British ponies were found on three other chromosomes: ECA1, ECA8, and ECA16.

Significance of the Study

• This study offers novel insights into the genetic control of height within native breeds of ponies in the British Isles. It generates genetic markers that could potentially be used in selective breeding strategies to optimize height for specific requirements in the equine industry.
• The results also lay foundations for further research into the genetic control of other morphological traits in equine breeds.