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Maintenance – NRC, 2007 vs. NRC, 1989

Maintenance – NRC, 2007 vs. NRC, 1989. Energy Requirements – Work – NRC, 1989. Light work DE, Mcal = 1.25( DE m ) Moderate work DE, Mcal = 1.50( DE m ) Intense work DE, Mcal = 2.00( DE m ). Energy Requirements for Exercise. Mcal DE/hour/100 kg wt Slow walk = 0.17 Fast walk = 0.25

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Maintenance – NRC, 2007 vs. NRC, 1989

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  1. Maintenance – NRC, 2007 vs. NRC, 1989

  2. Energy Requirements – Work – NRC, 1989 • Light work • DE, Mcal = 1.25(DEm) • Moderate work • DE, Mcal = 1.50(DEm) • Intense work • DE, Mcal = 2.00(DEm)

  3. Energy Requirements for Exercise • Mcal DE/hour/100 kg wt • Slow walk = 0.17 • Fast walk = 0.25 • Slow trot = 0.6 • Med. trot/slow lope = 1.0 • Fast trot/lope = 1.3 • Cantering, galloping = 2.0 • Polo, racing = 3.9

  4. Energy Requirements for Exercise • Example: • 513 kg horse • Fast walk, 2 h daily • 100 kg rider + equipment

  5. Energy Requirements for Exercise • 513 kg BW • DEm = 33.3 kcal DE/kg BW • 33.3 kcal DE/kg BW x 513 kg BW = 17,083 kcal • or 17.1 Mcal DE for maintenance

  6. Energy Requirements for Exercise • 513 kg horse, fast walk, 2 h daily, 100 kg rider + equipment • Mcal DE/hour/100 kg wt • 0.25 Mcal/h x 2 h x 613 kg/100 kg = 3.065 Mcal/day for activity • 17.1 + 3.1 = 20.2 Mcal DE total

  7. Energy Requirements for Exercise • DEm for exercising horses may be higher • Post-exercise metabolic rate • DEm = 36.3 kcal/kg BW • Stereotypic behavior • Cribbing, weaving, stall walking

  8. 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 • Minimun, Average, Elevated have same definitions as for DEm

  9. CP/Lys Requirements – Maintenance • Minimum: CP (g/d) = 500 kg x 1.08 • 500 kg x 1.08 = 540 g CP • Average: CP (g/d) = 500 kg x 1.26 • 500 kg x 1.26 = 630 g CP • Elevated: CP (g/d) = 500 kg x 1.44 • 500 kg x 1.44 = 720 g CP

  10. CP/Lys Requirements – Maintenance • Lysine (g/d) = CP (g/d) x 4.3% • CP is already adjusted for minimum, average or elevated requirements

  11. CP/Lys Requirements – Maintenance • Minimum: Lys (g/d) = 540 g CP x 0.043 = 23 g Lys • Average: Lys (g/d) = 630 g CP x 0.043 = 27 g Lys • Elevated: Lys (g/d) = 720 g CP x 0.043 = 31 g Lys

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