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Journal of Dairy Science Vol. 51 No. 3 385-391
© 1968 by American Dairy Science Association ®
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Influence of Feeding Schedule, Type of Forage, and Ratio of Flaked Corn to Forage on Rumen Fermentation1

M. E. McCullough and W. W. G. Smart, Jr.

Animal Science Department, Georgia Experiment Station, Experiment

ABSTRACT

Fistulated steers were fed corn silage or Coastal Bermuda hay with four ratios of a flaked corn mixture (20:80, 40:60, 60:40, and 80:20). The rations were fed in four equal portions at six-hour intervals. This method of feeding created an even level of rumen fermentation and resulted in nonsignificant differences in volatile fatty acid (VFA) concentration at various sampling periods. Corn silage resulted in a higher concentration of VFA than hay at all ratios of forage to grain. The high concentration of Na in the rumen fluid indicated a dominant role for the mineral in buffering VFA in the rumen.

In a second trial, corn silage and the grain mixture was fed at a grain-to-silage ratio of 60:40 in three sequences: 1) four equal feeds at six-hour intervals, 2) grain at 7 AM and 7 PM and silage at 1 PM and 1 AM, and 3) all grain at 7 AM and 1/3rd of silage at 1 PM, 7 PM, and 1 AM. Feeding Schedules 2 and 3 significantly increased the production of propionic acid. Feeding all grain at 7 AM created a significantly different pattern of fermentation than the other rations. The data indicate that feeding programs can be developed which should permit high levels of grain feeding without reducing milk fat percentage.

FOOTNOTES

1 Journal Paper no. 140, University of Georgia College of Agriculture Experiment Stations, Georgia Experiment Station, Experiment, Georgia.






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Copyright © 1968 by the American Dairy Science Association ®.