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Feeding for Sound Growth. Major concern – Developmental Orthopedic Disease Bone & joint disorders Enlargements and deformities of: Fetlocks, knees, hocks Faster growing, earlier maturing, larger horses more susceptible. Nutritional Causes of DOD. 1. Fast growth rate, large body size

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Feeding for sound growth
Feeding for Sound Growth

  • Major concern – Developmental Orthopedic Disease

  • Bone & joint disorders

  • Enlargements and deformities of:

  • Fetlocks, knees, hocks

  • Faster growing, earlier maturing, larger horses more susceptible


Nutritional causes of dod
Nutritional Causes of DOD

  • 1. Fast growth rate, large body size

  • 2. Excess energy intake

  • 3. Slow growth followed by rapid growth

  • 4. Mineral imbalances

    • Low Ca, Low P, High P

    • Low Cu, Low Zn


Feeding practices that cause dod
Feeding Practices that Cause DOD

  • Grain inadequate in P, Cu, Zn when feeding alfalfa

  • Grain inadequate in lysine, Ca, P, Ca, Zn when feeding grass hay

  • Excessive amount grain

  • Over-feeding young horses in poor condition


Ca & P

  • Ratio important – 2:1 in diet

  • Adults < 6:1, growing < 3:1

  • Bran – low Ca, high P (1:13)

  • Grains – low Ca, high P (1:5 to 1:10)

  • Hays – high Ca, low P (5:1 to 1.5:1)


Ca & P

  • Deficiency Ca and/or P can cause bone mobilization, developmental orthopedic disease

  • High P – interferes with Ca

  • High Ca – interferes with P, Zn


Cu zn
Cu & Zn

  • Critical for normal bone growth

  • Cu and/or Zn deficiency = DOD

  • Cu excess = death

  • Zn excess = Cu deficiency, DOD


Cu zn1
Cu & Zn

  • Growing horses

    Cu = 150 mg/d or 25 ppm

    Zn = 450 mg/d or 75 ppm

  • Adults

    Cu = 150 mg/d or 15 ppm

    Zn = 450 mg/d or 45 ppm


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