Reproductive success in Thoroughbred broodmares post large colon resection or colopexy.
Authors: Knudsen Anja R, Marsh Joseph S, Pye Jannah L
Journal: Veterinary surgery : VS
Summary
# Editorial Summary: Reproductive Outcomes Following Large Colon Surgery in Thoroughbred Broodmares A retrospective analysis of 29 Thoroughbred broodmares treated surgically for large colon disease between 2006 and 2023 compared reproductive success between two operative approaches: resection (n = 19) and colopexy (n = 10), with breeding outcomes tracked through Australian and New Zealand Studbooks. Both groups demonstrated comparable live foal production rates—60.5% post-resection and 68.2% post-colopexy—which aligned closely with the national breeding average of 64.3%, indicating no clinically meaningful difference between surgical techniques. Whilst the resection group showed marginally lower conception success in the immediate post-operative breeding season relative to subsequent years, this finding did not withstand statistical correction for multiple comparisons and disappeared entirely when unserved mares were excluded from analysis. These findings suggest that large colon resection need not be avoided on reproductive grounds and should not influence surgical decision-making between resection and colopexy; however, the authors appropriately acknowledge the limited sample size and recommend larger prospective studies to clarify the apparent initial reduction in breeding success post-resection and establish clearer breeding recommendations during early recovery.
Read the full abstract on PubMed
Practical Takeaways
- •Choice between large colon resection and colopexy should not be based on concerns about breeding prospects—both procedures yield comparable reproductive outcomes in mares
- •Mares requiring large colon surgery can return to breeding successfully, with performance matching national averages when managed appropriately post-operatively
- •Allow at least two breeding seasons post-resection before fully evaluating reproductive success, as first season performance may be reduced
Key Findings
- •No significant difference in reproductive success between mares post-large colon resection (60.5% live foal/mare served) and post-colopexy (68.2%)
- •Both surgical groups achieved similar live foal percentages to the Racing Australia national average (64.3%)
- •First breeding season post-resection showed lower success than subsequent seasons, but this did not reach statistical significance after correction for multiple comparisons
- •Reproductive success is achievable in Thoroughbred broodmares following large colon resection