Preliminary heritability of complete rotation large colon volvulus in Thoroughbred broodmares.

The research article investigates the inheritability of large colon volvulus (LCV), a serious health issue affecting horses, specifically periparturient Thoroughbred broodmares. The study’s main objective was to estimate if LCV can be inherited in these horses.

Study Population and Data Collection

• The research was conducted in central Kentucky and involved Thoroughbred broodmares from three different farms. The study classified mares that had undergone surgical correction for LCV as cases, while those with no history of surgical colic served as the control group.
• Thirty-nine cases were identified in total, along with 191 controls. Notably, the mares that constituted the LCV cases were significantly younger than the control horses when the incident occurred.
• Overall, the study was based on the five-generation pedigrees of 230 horses (including the cases and control group) which brought the total population present during the research to 2223 horses.

Results and Interpretation

• The heritability of LCV was estimated using a logit sire model with binomial data, considering the factors such as year of birth and the farm on which the horses resided, as fixed effects.
• Research findings revealed an estimated LCV heritability of approximately 0.311±0.383. This suggests a moderate heritability for LCV among Thoroughbred broodmares, signifying that there is some genetic predisposition towards this condition.
• However, the specific heritability value could vary and further, more expansive studies including more thoroughbred broodmares from these and other farms would help to provide a more accurate estimate.

Conclusion

• Ultimately, the study indicates that LCV may be a moderately heritable disease in Thoroughbred broodmares. This implies that there may be genetic factors at play that increase the likelihood of this category of horses contracting this life-threatening illness.
• The findings are significant as they can contribute to improving breeding practices and health management for Thoroughbred broodmares in the future, potentially reducing the risk of LCV.