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Protein and Amino Acid Evaluation of Commercially Grown Opaque-2 Corn¹

Virginia Polytechnic Institute and State University, Blacksburg 24061

D. H. Baker, G. R. Carlisle, B. G. Harmon and A. H. Jensen

University of Illinois, Urbana 61801

Abstract

The protein content of 18 samples of commercially grown opaque-2 corn obtained from various areas in Illinois was 8.9 ± .17% and the lysine content was .33 ± .01% (mean ± SEM and based on 90% dry matter). For 30 samples of commercially grown opaque-2 corn obtained from various areas in Virginia in 1973, the protein content was 8.37 ± .07% and the lysine content was .37 ± .01%. For 26 samples of opaque-2 corn obtained in Virginia in 1974, the protein content was 8.61 ± .17% and the lysine content was .36 ± .01%. The protein content of 10 samples of normal corn obtained in Virginia in 1973 was 8.72 ± .24% and the lysine content was .25 ± .01%. The protein content of 18 samples of normal corn obtained in Virginia in 1974 was 8.52 ± .22% and the lysine content was .27 ± .01%. There was a positive linear relationship between protein (X) and lysine (Y) content of opaque-2 corn: Y = .037X + .002 (r = .62; P<.01) for Illinois; Y = .044X – .002 (r = .59; P<.01) for Virginia in 1973; and Y = .032X + .084 (r = .80; P<.005) for Virginia in 1974. There was no relationship between protein and lysine content of normal corn in 1973 with only a weak relationship (P<.05) in 1974.

Results of three feeding trials using opaque-2 corn grown commercially in Virginia indicate that the lysine in opaque-2 corn is as available for growing pigs as the lysine in normal corn and that feedlot performance is directly related to the lysine content of the corn.

¹ Appreciation is expressed to C. F. Jordan, John Blaha and Charlie Babb for their help in conducting the feeding trials; to C. R. Cooper, J. H. Carter, L. B. Allen and Swanson Jennings for collecting samples and to C. Y. Kramer for statistical analysis of feeding trial data; to Mr. John Buschmann, New Canton, Va. for donating the high lysine corn used in two of the feeding trials; to Carole Shipp and M. R. Holland for calculating amino acids; to the Virginia Pork Industry Commission for financial support.