Energy Metabolism in Light Horses

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Abstract
Energy utilization was determined in two 4-yr. old geldings weighing 500 and 420 kg in a series of four balance trials. Retention of DE, ME and NE was determined for each horse at intake levels calculated to supply energy for maintenance, one and one-half times maintenance and twice maintenance. An attempt was made to measure basal heat production of the horses so that net energy requirements for maintenance could be estimated. Heat production measured on days 3 and 4 of a 4-day fasting period was approximately 93 kcal/W.75kg. Since this value deviated considerably from the established inter-specific value for basal heat production of 70 kcal/W.75kg. and the respiratory quotients of the horses indicated the conditions of fasting metabolism were not met, it was concluded that this value did not represent the net energy requirement for maintenance (NEm). Energy requirements for maintenance were estimated by extrapolation from the data to be 142.2 kcal DE/W.75kg and 123.5 kcal ME/W.75kg. Efficiency of energy utilization appeared to be the same at the three levels of energy intake studied. Copyright © 1970. American Society of Animal Science . Copyright 1970 by American Society of Animal Science

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