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Influence of Level of Dehydrated Coastal Bermudagrass¹ or Rice Straw on Digestibility

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

Abstract

Digestion trials were conducted with steers fed rations that contained 0, 20, 40, 60, 80 or 100% dehydrated Coastal bermudagrass or rice straw pellets to study the influence of roughage level on ration digestibility. As the level of roughage increased the digestibility of energy, dry matter, organic matter and nitrogen-free extract decreased and crude fiber digestibility increased linearly. The response was also quadratic when rice straw was fed. The type of roughage did not appear to influence energy digestibility at the 20% level but as the level increased the decrease in digestibility was more rapid for rice straw. Crude fiber digestibility was similar at the 0 and 20% roughage levels with a marked increase at the 40% and smaller increases to the 60 and 80% levels. Crude fiber digestibility continued to increase with Coastal bermudagrass but decreased sharply with rice straw at the 100% level.

¹ Appreciation is expressed to American Cyanamid Company, Princeton, New Jersey for urea, to Chas. Pfizer and Company, Terre Haute, Indiana for vitamin A and to Pellets, Inc. Mer Rouge, Louisiana, for the dehydrated Coastal bermudagrass pellets used in these investigations.

² Rice Experiment Station, Crowley, Louisiana70526.

³ Department of Animal Science, La. State University, Baton Rouge, 70803.

⁴ Iberia Livestock Experiment Station, A.R.S., Jeanerette, Louisiana, 70544.

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