J. Anim Sci.
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J. Anim Sci. 1974. 38:430-436.
© 1974 American Society of Animal Science
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Artificially Altered Corn Grain Harvested at Three Moisture Levels. III. In Vitro Utilization of the Carbohydrate and Nitrogen Fractions1

Michael M. Danley and R. L. Vetter2

Iowa State University, Ames 50010

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 {alpha}-amylase and ß-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.

Footnotes

1 Part of a dissertation submitted by the senior author to Iowa State University in partial fulfillment of the requirements for a Ph.D. degree in Animal Science and Agronomy. Journal Paper No. J-7470 of the Iowa Agriculture and Home Economics Experiment Station, Ames, Iowa. Project No. 1559.

2 Department of Animal Science.






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Copyright © 1974 by the American Society of Animal Science.