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Energy Value of Various Feeds for the Young Pig

Illinois Agricultural Experiment Station, Urbana

Abstract

In a series of balance studies the energy value of 18 feeds for swine was determined as digestible energy, metabolizable energy, and metabolizable energy adjusted for nitrogen balance. Values were obtained by feeding each test material in addition to a control mixture formulated to provide adequate amounts of all nutrients, except energy. Pigs weighing 15.4 kg. were individually fed in metabolism cages for a 6-day collection period. Gross energy and nitrogen determinations on the feeds, feces, and urine were made for all pigs.

Pigs which received a diet containing at least 35% crude protein in the diet excreted an average of 6.77 kcal. in the urine per gram of urinary nitrogen, and this value was used to adjust all metabolizable energy values for nitrogen balance. The unadjusted metabolizable energy and the metabolizable energy adjusted for nitrogen balance averaged 94.7±5.3% and 91.6±6.3% of the digestible energy, respectively.

¹ Part of a thesis submitted by the senior author in partial fulfillment of the requirements for the Ph.D. degree at the University of Illinois.

² Present address: Department of Animal Husbandry, Mississippi State University, State College, Mississippi.