The document summarizes a study on the incidence of angular and flexural limb deformities (ALD) in Standardbred racehorses in New Zealand and the influence of ALD on racing success. The study found that 14.81% of horses had ALD with no difference between fillies and colts. Horses with ALD were less likely to qualify for races before age 4 compared to horses without ALD. The incidence of ALD did not differ between farms or years. Certain sires were more likely to produce foals with ALD.

1. The incidence of angular and flexural limb deformities in Standardbreds in New Zealand and the influence on racing success By: Boukje Erdtsieck Supervisors: Dr. C.W. Rogers Prof. Dr. P.R. van Weeren

3. Importance of the study

15. Results : influence on racing success Normal percentage of qualification (based on season 02-03) Normal percentage of qualifying (season 02-03) 100 333 280 53 Total 100 38,74 129 101 28 NQ 61,21 1,8 6 6 0 Q 5 YO 59,64 10,81 36 32 4 Q 4 YO 48,65 28,83 96 83 13 Q 3 YO 19,82 19,82 66 58 8 Q 2 YO Percentage cumulative Percentage Total No ALD ALD

16. Results : Qualifying and ALD

27. Questions or suggestions? Questions?