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Genetics of Racing Performance in the American Quarter …
https://academic.oup.com/jas/article-abstract/66/11/2791/4695768
Genetics of racing performance in the American Quarter Horse
https://dr.lib.iastate.edu/handle/20.500.12876/64953/
Individual races within tracks, years and days controlled a major portion of the variation in racing time (over 60%) and were defined as contemporary groups within which genetic differences among horses were evaluated. Heritability and repeatability estimates for racing performance were data dependent.
Genetic predictions of racing performance in quarter horses
https://academic.oup.com/jas/article/69/9/3891/4705662
Research on the racing performance of quarter horses has been used to develop genetic prediction summaries on all horses with at least one start on record at the American Quarter Horse Association. In the 1987 summary, records from a total of 212,065 horses were used to give genetic predictions on stallions, mares, geldings, fillies, and colts.
Genome-Wide Signatures of Selection Reveal Genes …
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6060370/
Previous studies have shown that genetic diversity within the QH is high when compared to other horse breeds (McCue et al., 2012; Petersen et al., 2013a,b), which can be attributed to factors including genetic influence from other breeds (such as the Thoroughbred), as well as rapid and continuous population expansion (Petersen et al., 2014).
Study: Genetic Differences in Racing, Cutting Quarter …
https://thehorse.com/111411/study-genetic-differences-in-racing-cutting-quarter-horses/
Meira said she and colleagues identified regions in the genome that had been clearly affected by the selective breeding process over the last several decades in creating racing and cutting lines....
American Quarter Horse - horse genetics
https://www.horse-genetics.com/American-Quarter-Horse.html
Quarter Horse range in height from 14.2 hands to 17 hands, and typically weigh 1,000 to 1,500 pounds. The Quarter Horse is known for its short, fine head with small, alert ears and alert eyes set wide apart. The profile of the Quarter Horse is usually straight. The neck of the Quarter Horse is well-muscled, well-formed, and a bit arched.
Frontiers | Genome-Wide Signatures of Selection Reveal …
https://www.frontiersin.org/articles/10.3389/fgene.2018.00249/full
The number of annotated genes located within these ROI ranged from 78 in the working cow subpopulation to 171 in the racing group, with an average of 105 genes identified per subpopulation. Across all 6 QH performance groups a total of 635 genes were situated within these putative signatures of selection.
Horse Genetics Explained - AQHA
https://www.aqha.com/-/horse-genetics-decoded
“That’s the reason the old-time (Quarter Horse breeders) inbred: to set the breed up, to breed homozygous individuals able to pass on common traits each time.” Homozygous gene pairs carry two identical genes for a trait at a given location on the chromosome, ensuring that a homozygous individual will pass on that trait to the next generation.
Genetics of racing performance in the Japanese …
https://onlinelibrary.wiley.com/doi/10.1111/j.1439-0388.1994.tb00446.x
Months accounted for an average of 12.7% of the total variance on turf and 8.8% on dirt indicating an effect of season that influences racing speed more on turf than dirt. Days within months, years, and courses were important and larger on turf (average was 8.6%) than dirt (average 2.4%).
Breeding Responsibly - AQHA
https://www.aqha.com/-/breeding-responsib-1
A team of 11 researchers from the University of California at Davis and the University of Minnesota took DNA from a nationwide random sampling of registered Quarter Horses and tested it for five genetic diseases: glycogen branching enzyme deficiency (GBED) hereditary equine regional dermal asthenia (HERDA) hyperkalemic periodic paralysis (HYPP)
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