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Equine Energetics. I. Relationship Between Body Weight and Energy Requirements in Horses

Cornell University, Ithaca, NY 14853

Abstract

Energy balance studies using indirect calorimetry were conducted with four mature equids ranging in weight from 125 to 856 kg. Each animal was fed three different levels of intake of the same diet. The amounts of digestible and metabolizable energy required for zero energy balance were determined by calculating regression equations for energy balance against energy intake. It was concluded that the maintenance requirements of equids vary linearly with body weight. No advantage was found for the use of weight^.75 for the comparison of equids within the range studied. The digestible energy (DE) requirement for equids confined to metabolism stalls was DE (kcal/d) = 975 + 21.28 x W where W equals body weight in kg. If a factor for activity similar to that suggested by the National Research Council was included, the requirement could be calculated by the equation: DE (kcal/d) = 1,375 + 30.0 x W.

¹ Present address: Manna Pro Corp., 4929 Wilshire Blvd., Los Angeles, CA 90036.

² The authors gratefully acknowledge the assistance of Mary Flinn, D. Scheraga, L. V. Soderholm, Terry Kinsman and Janice Williams.

³ Send reprint requests to H. F. Hintz, Cornell Univ., Ithaca, NY 14853.

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