AI Article Synopsis
- The study analyzed the impact of runs of homozygosity (ROH) on racing traits in North American Thoroughbreds, finding that higher inbreeding (F) didn't affect the likelihood of horses racing but did correlate with fewer race starts.
- Among raced horses, those with a 10% higher inbreeding coefficient were predicted to have 3.5 less race starts than average.
- The research suggests that managing inbreeding levels could improve racing longevity in this horse population.
Article Abstract
The proportion of the genome containing runs of homozygosity (ROH) affects production traits in livestock populations. In European and Australasian Thoroughbreds inbreeding, quantified using ROH (F ), is associated with the probability of ever racing. Here, we measured F using 333 K SNP genotypes from 768 Thoroughbred horses born in North America to evaluate the effect of inbreeding on racing traits in that region. Among North American horses, F was not associated (p = 0.518) with the probability of ever racing but was significantly associated with the number of race starts (p = 0.002). Among raced horses, those with a 10% higher F than the mean inbreeding coefficient were predicted to have 3.5 fewer race starts compared to horses with a mean inbreeding coefficient. Considering the trend of increasing inbreeding and a decline in the average number of race starts per runner in North America, mitigating inbreeding in the population could positively influence racing durability.
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| http://dx.doi.org/10.1111/age.13309 | DOI Listing |
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