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Nitrogen and Energy Utilization of New Endosperm Types of Corn with Growing Steers¹

Purdue University, West Lafayette, Indiana 47907

Abstract

Two metabolism studies were conducted to compare the nutritional value of a number of different corn varieties for growing steers. The first experiment was conducted with normal, opaque-2, waxy and waxy opaque-2 corn; and the second experiment was conducted with isogenic backgrounds of normal, sugary-2, sugary-2 opaque-2 and waxy corn. Results of experiment 1 indicate that waxy corn was 3.5 percentage units lower (P<.05) in digestible energy than normal, opaque-2 or waxy opaque-2 corn. In experiment 2, steers fed the sugary-2 opaque-2 diet had 17 percentage units higher (P<.05) absorbed nitrogen retained and 15 percentage units higher (P<. 10) dietary nitrogen retained than steers fed the normal and sugary-2 corn-soybean meal diets. All other parameters studied indicated no significant differences among genotypes.

¹ Journal Paper No. 5902 of the Purdue University Agricultural Experiment Station.

² Department of Animal Science.

³ Department of Agronomy.