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Opaque-2, Higher-Oil Higher-Protein and Regular Corn in Diets for Growing Lambs

University of Illinois, Urbana²

Abstract

Three nitrogen balance experiments were conducted with growing lambs. In the first experiment higher-oil higher-protein corn was compared with regular corn, with or without supplementary urea and L-lysine, DL-methionine and DL-tryptophan alone and in combination, in high-concentrate diets fed to 42 grade wether lambs. Lambs fed regular corn with no supplementary nitrogen retained significantly (P<.05) less nitrogen than lambs fed higher-oil higher-protein corn or regular corn with supplementary nitrogen. The addition of all three of the amino acids to regular corn produced results comparable to those for higher-oil higher-protein corn, but showed no increase in nitrogen retention over regular corn plus urea. Differences (P<.05) in dry-matter digestibility were not significant. In the second experiment, Opaque-2 corn was compared with regular corn, with and without supplemental lysine, in high-concentrate diets fed to 16 Hampshire ewe lambs. In experiment 3 Opaque-2 corn was compared with a higher-oil higher-protein corn and regular corn in high-concentrate diets fed to 24 Rambouillet ewe lambs. In both balance experiments, no significant differences (P<.05) were found among dietary groups in terms of dry-matter digestibility or nitrogen retention.

¹ Present Address: Route 2, Jacksonville, Illinois.

² Department of Animal Science.