J. Anim Sci.
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J. Anim Sci. 1973. 36:883-887.
© 1973 American Society of Animal Science
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Protein Levels for Swine Fed to Heavy Weights. I. Effects on Gain and Feed Efficiency1

Keith B. Gilster2 and Richard C. Wahlstrom3

South Dakota State University, Brookings 57006

Abstract

A Total of 312 crossbred pigs, 216 barrows and 96 gilts, were used in three trials to determine the effect of dietary protein level during three growth periods of the pig. Pigs were fed corn-soybean meal supplemented diets from approximately 20 to 113 kilograms.

Pigs fed a 12% protein diet from 20 to 45 kg body weight gained less rapidly compared to those fed 16, 18 or 20% protein and required more feed/gain. Pigs fed 20% protein diets also had a significantly improved feed/ gain ratio compared to those fed 16% protein.

Significantly less daily gains and increased feed/gain occurred when pigs were fed diets of 10% protein from 45 to 77 kg body weight. Pigs fed diets of 12% protein during this period required slightly more feed/gain than those fed 16% protein. Diets of 10% protein were also inadequate to promote optimum gain and feed efficiency of pigs from 77 to 113 kg body weight, although the degree of response was affected by previous dietary treatment.

The data indicate that dietary protein levels of 16, 12 and 12% fed during the periods of 20 to 45, 45 to 77 and 77 to 113 kg, respectively, are adequate for daily gain. However, for maximum feed efficiency levels of 18, 14 and 12% would be suggested.

Footnotes

1 Published with the approval of the Director of the South Dakota Agricultural Experiment Station as Publication No. 1118 of the Journal Series.

2 Present address: University of Nebraska, Lincoln, Nebraska 68503.

3 Department of Animal Science.






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Copyright © 1973 by the American Society of Animal Science.