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Nutrient utilization by limit- and ad libitum-fed growing horses.

N F Cymbaluk1, G I Christison, D H Leach

  • 1Dept. of Herd Med. and Theriogenol, University of Saskatchewan, Saskatoon, Canada.

Journal of Animal Science
|February 1, 1989
PubMed
Summary

Feeding level impacts nutrient digestibility in young horses. Ad libitum feeding increased energy and protein digestibility after 12 months, but adjustments for dry matter intake removed these differences. Mature ponies utilized energy more efficiently than young horses.

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Area of Science:

  • Equine nutrition
  • Animal science
  • Digestive physiology

Background:

  • Understanding nutrient digestibility is crucial for optimizing growth and health in young horses.
  • Dietary intake levels can influence nutrient utilization in weanling horses.
  • Limited research exists on the long-term effects of feeding regimens on equine nutrient digestibility.

Purpose of the Study:

  • To evaluate the effect of limit- versus ad libitum feeding on nutrient digestibility in Quarter Horse and Paint weanlings.
  • To assess changes in energy and protein digestibility over time (6-24 months of age).
  • To compare nutrient utilization between young horses and mature ponies.

Main Methods:

  • Eighteen weanling colts were divided into limit-fed and ad libitum-fed groups.

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  • Nutrient digestibilities were measured at three age intervals: 6-12, 12-18, and 18-24 months.
  • Digestibility of energy, protein, calcium (Ca), and phosphorus (P) were assessed.

    • Main Results:

    • Energy and protein digestibility differences between feeding groups were eliminated when adjusted for dry matter intake after 12 months.
    • Mature ponies showed similar energy utilization to growing horses up to 18 months but greater efficiency at 24 months.
    • All horses maintained adequate P absorption until 18 months, but entered negative P balance by 24 months, despite adequate intake.

    Conclusions:

    • Feeding level does not significantly impact energy and protein digestibility in young horses beyond 12 months when adjusted for dry matter intake.
    • Mature ponies exhibit more efficient energy utilization than young horses at 24 months.
    • Young horses may be at risk for negative phosphorus balance by 24 months, necessitating further investigation into P requirements and absorption.