J. Anim Sci.
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J. Anim Sci. 1972. 34:672-676.
© 1972 American Society of Animal Science
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Influence of Grinding, Supplemental Nitrogen Source and Roughage on the Digestibility of Corn1

T. W. White2, F. G. Hembry3 and W. L. Reynolds4

Louisiana Agricultural Experiment Station, Crowley 70526 and Baton Rouge 70803 and U.S. Department of Agriculture, Jeanerette 70544

Abstract

Two metabolism trials were conducted with steers to determine the influence of grinding and nitrogen source on the digestibility of shelled corn, the effect of roughage on digestible energy content and to compare corn and sorghum grain. Grinding the corn or replacing the soybean protein with urea did not influence energy, dry matter, nitrogen-free extract, or crude protein digestibility or digestible energy content. The addition of 20% rice straw decreased the digestibility of all nutrients as well as the digestible energy content of the concentrate. There was a consistent trend for the pH and the proportions of acetate and butyrate to be higher and propionate and total VFA to be lower on the whole than on the ground corn rations, which suggests that the whole corn has some roughage characteristics. There was very little difference in the digestibility or ruminal fluid when sorghum grain or corn rations were fed.

Footnotes

1 Appreciation is expressed to American Cyanamid Company, Princeton, New Jersey for urea and to Chas. Pfizer and Company, Terre Haute, Indiana for vitamin A used in these investigations.

2 Rice Experiment Station, Crowley, Louisiana.

3 Department of Animal Science, Louisiana State University, Baton Rouge.

4 Iberia Livestock Experiment Station, A.R.S., Jeanerette, Louisiana.






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Copyright © 1972 by the American Society of Animal Science.