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Influence of Metabolizable Energy Level on Performance, Carcass Characteristics and Rectal Temperature in Swine¹

Lincoln University, Jefferson City, Missouri 65101

Abstract

Growing and finishing diets for swine were formulated to supply 87.5, 100 and 112.5% of the National Research Council requirements for digestible energy. The metabolizable energy (ME) contents of these diets were determined and the effects of the diets on gain, feed efficiency, carcass traits and body temperature were studied in experiments with a total of 72 market swine.

Diets contained 17 and 14% protein for the growing and finishing phases, respectively and contained 4,078 and 3,842 (high); 3,612 and 3,277 (control); and 3,104 and 2,875 (low) kcal ME/kg. Pigs fed the high diet required less feed, but more calories per kilogram gain than did those fed control and low diets. Pigs fed the low diets had lower dressing percent and those fed the high diets had a lower carcass specific gravity than the other two treatments. The control level of ME with its corresponding calorie: protein ration apparently supported optimum performance. Body temperature was not affected by dietary energy levels.

¹ Cooperative Contribution from Department of Agriculture, Lincoln University and Missouri Agricultural Experiment Station. Journal Series No. 7372. Approved by the Director.

² Chairman and Professor, Division for Applied Arts and Sciences, Lincoln University.

³ Professor, Animal Husbandry, University of Missouri-Columbia.

⁴ Professor, Food Science and Nutrition, University of Missouri-Columbia.

⁵ Current Address, College of Veterinary Medicine, University of Missouri-Columbia.

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