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Protein Levels for Pigs as Studied by Nitrogen Balance

Illinois Agricultural Experiment Station, Urbana

Abstract

Using well-fortified practical diets, a study was made of the minimum protein intake of pigs for maximum nitrogen retention. The precision of 3-, 5-, and 7-day collection periods was also compared.

With 50-lb. pigs, nitrogen retention increased to about the 18% protein level. With 150-lb. pigs, the data suggest that crude protein levels from 10 to 22% affect nitrogen retention, but the differences were not statistically significant.

After a 10-day preliminary period, a 7-day collection period offered only a little advantage over a 3-day collection period in the case of 50-lb pigs, and even less advantage with 150-lb. pigs.

¹ This material is based upon 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. Present address: Department of Animal Husbandry, The University of Georgia, Athens.

² The authors wish to acknowledge Central Soya Co., Inc., Fort Wayne, Indiana; A. E. Staley Mfg. Co., Decatur, Illinois; Merck and Co., Rahway, New Jersey, and American Cyanamid Co., Pearl River, New York, for funds and products which made this investigation possible.