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An Attempt to Locate the Most Advantageous Percentage of Protein in the Ration of Growing-Fattening Pigs of Different Weights

A Preliminary Report

University of Illinois and Ohio Agricultural Experiment Station

Abstract

The percentage of protein in the ration that will best meet the needs of growing-fattening pigs has not been investigated as thoroughly as the practical importance of the subject warrants. Accordingly, work in this field was undertaken at the Illinois Agricultural Experiment Station in 1931. The data to be reported in this paper have been taken from the results of five recent dry-lot group-feeding trials.

The object as set forth for the group-feeding portion of the study was to determine as accurately as the method would permit the percentages of protein in the ration which, when fed under practical conditions, would stimulate maximum gains of pigs at various weights throughout the fattening period.

Because the relation between the protein and the energy needs of growing animals changes greatly with increasing weight, it appears that the percentage of protein in the ration which will meet the protein requirements at different live weights might best be determined by investigating the needs over small segments of the growth curve separately.