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Feeding Young Horses. Goal: Rapid growth with as few developmental and health problems as possible. Feeding Young Horses. Energy Protein-Amino acids – Lysine Minerals Macro – Ca, P Micro – Cu, Zn. Reaching Mature Size. First year most critical 90% of height, 65% of weight See table

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feeding young horses
Feeding Young Horses
  • Goal: Rapid growth with as few developmental and health problems as possible
feeding young horses1
Feeding Young Horses
  • Energy
  • Protein-Amino acids – Lysine
  • Minerals
    • Macro – Ca, P
    • Micro – Cu, Zn
reaching mature size
Reaching Mature Size
  • First year most critical
    • 90% of height, 65% of weight
    • See table
  • At moderate rate of growth:
    • Mature height = 2 to 3 y
    • Mature weight = 3 to 5 y
protein energy for young horses
Protein & Energy for Young Horses
  • Weanlings
    • ADG = 1.4 to 1.9 lb
    • 2.8 to 2.9% total DMI
protein energy for young horses1
Protein & Energy for Young Horses
  • Yearlings
    • More moderate gains
    • ADG = 0.75 to 1.25 lb
    • After 1 yr, colts have 0.2 to 0.3 lb greater ADG than fillies
protein energy for young horses2
Protein & Energy for Young Horses
  • Two-year-olds
    • ADG = 0.25 lb (100 lb/year)
    • (May need more if in training)
energy requirements growing horses
Energy Requirements – Growing Horses
  • DEmaintenance + DEgain
  • DEm (kcal/kg BW/d) = 56.5X-0.145
    • X = age in months
energy requirements growing horses1
Energy Requirements – Growing Horses
  • DEmaintenance + DEgain
  • DEg (Mcal) = (1.99 + 1.21X – 0.021X2) x ADG
    • X = age in months
    • ADG = kg/day
energy requirements growing horses2
Energy Requirements – Growing Horses
  • Weanling, 227 kg, 0.75 kg ADG, 4 mo
  • DEm
  • DEm (kcal/kg BW/d) = 56.5(4-0.145)
    • 56.5 x 0.8179 = 46 kcal/kg BW
    • 46 kcal/kg x 227 kg = 10,442 kcal
    • Or 10.4 Mcal DE
energy requirements growing horses3
Energy Requirements – Growing Horses
  • DEgain
  • DEg (Mcal) = (1.99 + 1.21X – 0.021X2) x ADG
  • [1.99 + (1.21 x 4) – (0.021 x 16)] x 0.75
  • 6.49 x 0.75 = 4.9 Mcal DE
energy requirements growing horses4
Energy Requirements – Growing Horses
  • DEmaintenance + DEgain
  • 10.4 Mcal + 4.9 Mcal = 15.3 Mcal DE
protein requirements2
Protein Requirements

NRC, Lys:DE = 2

L.H. Breuer, 1998; Advances in Equine Nutrition I, KER

cp lys requirements maintenance
CP/Lys Requirements – Maintenance
  • Minimum: CP (g/d) = BW kg x 1.08
  • Average: CP (g/d) = BW kg x 1.26
  • Elevated: CP (g/d) = BW kg x 1.44
  • Lysine (g/d) = CP (g/d) x 4.3%
cp lys requirements maintenance1
CP/Lys Requirements – Maintenance
  • Total CP requirement = CPm + CPg
  • Growing horses:
    • CPm (g/d) = BW kg x 1.44
cp lys requirements growth
CP/Lys Requirements – Growth
  • CP (g/d) = (BW kg x 1.44) + ((ADG g x 0.20)/E)/0.79
  • E = efficiency of protein use

Protein in

gain

Protein digestibility

cp lys requirements growth1
CP/Lys Requirements – Growth
  • E = efficiency of protein use
    • 50% for 4-6 mo old
    • 45% for 7-8 mo old
    • 40% for 9-10 mo old
    • 35% for 11 mo old
    • 30% for 12 mo old or older