Artificially Altered Corn Grain Harvested at Three Moisture Levels. III. In Vitro Utilization of the Carbohydrate and Nitrogen Fractions1

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Abstract
Changes in the in vitro utilization of the carbohydrate and nitrogen fractions of artificially altered corn grain were determined. Field corn (Pioneer 3570), harvested at 22, 18 and 16% moisture, was altered by the following methods: untreated-ensiled, dried reconstituted-ensiled, formic acid reconstituted-ensiled, dried, microwaved and steamed. For the most part, significant (P <.05) differences occurred between 12- and 24-hr. incubations of corn grain harvested at 22% moisture and artificially altered; however, differences among methods of alteration that existed at 12 hr. remained unchanged after 24-hr. incubation. With the 12-hr. incubation, ensiled corn had significantly (P <.05) higher in vitro digestible dry matter (IDDM) and digestible total, carbohydrates (DTCHO) than heat-treated corn. Significant (P <.05) differences in IDDM and DTCHO existed between reconstituted and formic acid reconstituted corn and between microwaved and steamed corn. Differences in digestible α-amylase and β-amylase-soluble carbohydrates among methods of alteration were not significant (P <.05). Acetate production for heat-treated corn was significantly (P <.05) lower, and propionate production significantly (P <.05) higher, than for ensiled corn. Copyright © 1974. American Society of Animal Science . Copyright 1974 by American Society of Animal Science.

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