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Corn Maturity. II. Digestibility of Nutrients and Energy Value of Corn Grain of Various Maturities and Test Weights^1,2,

University of Minnesota, St. Paul⁴

Abstract

In two digestion studies, the apparent digestibilities of nutrients (ether extract, total carbohydrates, gross energy and organic matter) in corn grain increased as test weight (or maturity) increased. In both studies, the crude protein of the heaviest (most mature) corn was the most digestible. TDN and DE contents of corn increased as test weight increased. Regression analyses of the combined TDN values from both trials gave the equation: % TDN=78.0+0.0246X (X=test weight in gm./1.). Comparison of TDN and price indices indicated that the commonly applied test weight discount unduly discriminates against corn grain having a test weight less than 696 gm./liter.

¹ Paper No. 6860 of the Scientific Journal Series of the Minnesota Agricultural Experiment Station.

² Data taken from a thesis submitted by the senior author to the Graduate School in partial fulfillment of requirements for the degree of Master of Science.

³ Present address: Department of Animal Science, Iowa State University, Ames.

⁴ Department of Animal Science.