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CP/Lys Requirements – Maintenance

This document outlines the critical nutritional requirements for young horses, specifically focusing on crude protein (CP) and lysine intake. It details the formulas for calculating daily CP needs based on body weight and average daily gain (ADG), considering efficiency ratios for various growth stages. Additionally, it addresses the risks of developmental orthopedic disease (DOD) associated with rapid growth and excessive energy intake. Practical recommendations for ensuring balanced nutrition, including monitoring lysine and energy ratios, are provided to promote optimal bone development and overall health.

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CP/Lys Requirements – Maintenance

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  1. CP/Lys Requirements – Maintenance • Total CP requirement = CPm + CPg • Growing horses: • CPm (g/d) = BW kg x 1.44

  2. 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

  3. 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

  4. CP/Lys Requirements – Growth • 4 mo old, 168 kg, 0.84 kg ADG • CP (g/d) = (BW kg x 1.44) + ((ADG g x 0.20)/E)/0.79 • E = 50% for 4-6 mo old • CP (g/d) = (168 x 1.44) + ((840 g x 0.20)/0.5)/0.79 • CP (g/d) = 242 g + 425 g = 667 g CP

  5. CP/Lys Requirements – Growth • CP = 667 g CP • Lysine (g/d) = CP (g/d) x 4.3% • Lys (g/d) = 667 x 0.043 = 28.7 g

  6. Developmental Orthopedic Disease • “all general growth disturbances resulting from any alteration in normal bone formation”

  7. Protein & Energy for Young Horses • Excess protein does not cause DOD • But…… • Feeding excess energy and keeping Lys:DE ratio correct will result in excess protein intake • The excess energy causes DOD

  8. Protein & Energy for Young Horses • Very rapid growth rate and excess energy intake are one of the primary causes of DOD

  9. Horse with Grade 3 Gastric Ulcers • Gastro Guard – very expensive • Current diet = Hay + 2 cups sweet feed • Dull coat, posture of “greyhound dog” • Stall rest prescribed • Solutions???

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