Agronomy Journal Journal of Natural Resources and Life Sciences Education
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Published online 1 January 1973
Published in Agron J 65:99-100 (1973)
© 1973 American Society of Agronomy
677 S. Segoe Rd., Madison, WI 53711 USA
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Gains and Ruminal pH, NH3 and VFA of Beef Steers Fed Molasses or Molasses-Urea on Tall Fescue Pasture1

Richard H. Hart2, James Bond3, T. S. Rumsey3 and G. E. Carlson2

Molasses or molasses + urea supplements were fed free-choice to steers grazing tall fescue (Festuca arundinacea Schreb.) to determine the effects of supplemental energy and nitrogen on carrying capacity, animal gains, and rumen parameters. Carrying capacity, average daily gain, and gain per hectare were not increased by either supplement. Molasses alone depressed ruminal volatile fatty acids (VFA) and NH3 concentrations, but molasses + urea increased ruminal NH3. Ruminal pH and the molar percentages of the different ruminal VFA's were not substantially affected by either supplement, except for a temporary increase in butyrate, and a slight depression in iso-acids.

Key Words: Beef gains • Grazing • Supplemental feeding • Festuca arundinacea Schreb.

1 Contribution from the Plant Science Research and Animal Science Research Divisions, Agricultural Research Service, USDA, Beltsville, Md. 20705.

2 Research Agronomists, PSRD, ARS, USDA, Beltsville, Md. 20705.

3 Research Animal Scientists, ASRD, ARS, USDA, Beltsville, Md. 20705.

Received for publication May 3, 1972.




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Copyright © 1973 by the American Society of Agronomy.