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  • Short introduction of myself if necessary
  • Transcript

    • 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
    • 2. Outline
      • Importance of the study
      • Aims of the study
      • Definitions
      • Hypotheses
      • Materials and Methods
      • Results
      • Conclusions
      • Discussion
      • Further research
    • 3. Importance of the study
    • 4. Aims of the study
      • To score the incidence of angular limb deformities and flexural limb deformities in Standardbreds
      • To asses racing performance and compare foals with flexural or angular limb deformities to foals without angular or flexural limb deformities
    • 5. Definitions
      • Angular Limb Deformities (AnLD)
    • 6. Definitions
      • Flexural Limb Deformities (FLD)
        • “ contracted tendons”
    • 7. Definitions
      • Abnormal Limb Deformities
        • Flexural and Angular Limb Deformities
      +
    • 8. Hypotheses
      • Incidence
        • There is no difference in incidence of ALD between fillies and colts.
        • Some sires are more likely to produce progeny with ALD then others
      • Racing performance
        • Foals born with ALD have less racing success then foals that are born with straight legs
    • 9. Materials and Methods
      • 2 of the largest Standardbred farms on the Southern Hemisphere
    • 10. Materials and Methods
      • Clinical inspection of each foal within a day after it was born
        • Farm 1: experienced veterinarian
        • Farm 2: birth attendants
      • Foals scored on conformation of both front and hindlegs
    • 11. Materials and Methods
      • Farm 1: used to score incidence and racing performance
          • Season 02-03 and 03-04
      • Farm 2: used to score incidence
          • Season 03-04 and 04-05
      • Excluded: - foals that died before 01-08-07
      • - foals with no brand
    • 12. Materials and Methods
      • Racing performance
        • Qualifying or not
        • Age of qualifying
        • Total starts
        • Total amount of prizemoney won
        • Total amount of prizemoney per start
        • Exported
        • Season standards of New-Zealand (1 st August)
    • 13. Results : incidence
      • Total horses used: 1296
        • 178 with ALD
        • 1118 without ALD
      14,81 25,57 7,48 10,26 15,92 Percentage ALD 324 329 254 380 333 Total foals 279,5 262 235 341 280 No ALD 44,5 67 19 39 53 ALD Average per year Farm 2 04-05 Farm 2 03-04 Farm 1 03-04 Farm 1 02-03
    • 14. Results : influence of sires and ALD
      • Total horses used: 713
    • 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
    • 17. Results : Qualifying and ALD
          • Total of 713 horses used
            • 92 with ALD
            • 621 without ALD
      312 56 No 0,058 1,541(0,985-2,410) 309 36 Yes Qualified before the age of 4 P-Value OR No ALD ALD
    • 18. Results : Qualifying and sex
          • Total of 713 horses used
            • 352 fillies
            • 362 colts
      157 211 No >0,001 1,747 (1,299-2,350) 195 150 Yes Qualified before the age of 4 P-Value OR Colts Fillies
    • 19. Results : Total Prizemoney earned
          • Total of 336 horses used
    • 20. Results : Total amount of starts
          • Total of 336 horses used
    • 21. Results : Prizemoney per start
          • Total of 336 horses used
    • 22. Results : ALD and export
      • Total of 90 horses exported
      • from season 02-03 and 03-04
      11 79 Total 11 68 No ALD 0% 0 Exp. USA 13,92% 11 Exp. Australia Percentage ALD
    • 23. Conclusions
      • The incidence of ALD in Standardbreds
      • in New Zealand is 14,81 %
      • No difference in incidence of ALD between fillies and colts
      • Tendency that foals with ALD are less likely to qualify before the age of 4 compared to foals that do not have ALD
    • 24. Discussion
      • Scoring ALD
      • Incidence
      • Assessing racing success
    • 25. Follow up – research?
      • Difference between fillies and colts with ALD and racing success
      • Different sorts of ALD and the influence on racing success
      • Varus/valgus per joint and the influence on racing success
      • Decisions of trainers and owners regarding to ALD
    • 26.  
    • 27. Questions or suggestions? Questions?

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