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Published online 1 July 1970
Published in Agron J 62:543-546 (1970)
© 1970 American Society of Agronomy
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Influence of Drying Methods and Temperatures on in vitro Dry Matter Digestibility of Corn and Sorghum Fodder and Silage1

A. R. Schmid2, G. C. Marten3 and R. D. Goodrich2

The laboratory drying procedures of lyophilizing, or oven-drying at 50, 65, 80 or 100 C were applied to samples of fodder and silage of corn and sorghum. The residual moisture via vacuum desiccation over P2O5 and in vitro dry matter digestibility (IVDMD) were determined. The IVDMD of both fodder and silage was highest when dried via lyophilization. Lowest IVDMD was obtained from silage oven-dried at 100 C. Drying at 65 to 80 C (rapid drying) was found satisfactory for determination of IVDMD of fodder or silage. However, large losses of IVDMD were experienced in slow drying of fodder compared to fast drying. For biochemical determinations of silage oven-drying would not be satisfactory. High positive correlations were obtained between IVDMD of fodder and silage. Therefore, the IVDMD of corn and sorghum fodder should be a good measure of the relative differences which one might obtain in silage. The loss of IVDMD due to the ensiling process was 11.8%.

Key Words: digestibility • drying methods • lyophilization • freeze-drying • oven-drying • silage • fodder • Zea mays L. • Sorghum bicolor (L.) Moench.

1 Minnesota Agr. Exp. Sta. Paper No. 7136 Scientific Journal Series in cooperation with Crops Research Division, Agricultural Research Service, U. S. Department of Agriculture.

2 Associate Professor, Department of Agronomy and Plant Genetics, and Associate Professor of Animal Science, University of Minnesota, St. Paul 55101.

3 Research Agronomist, Crops Research Division, Agricultural Research Service, U. S. Department of Agriculture.

Received for publication January 5, 1970.




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Copyright © 1970 by the American Society of Agronomy.