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Journal of Dairy Science Vol. 46 No. 1 38-42
© 1963 by American Dairy Science Association ®
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Effect of Physical State of Coastal Bermuda Grass Hay on Passage through Digestive Tract of Dairy Heifers1

G. D. O'Dell, W. A. King, W. C. Cook and S. L. Moore

Department of Dairy Science, Clemson College, Clemson, South Carolina

ABSTRACT

The passage of Coastal Bermuda grass hay fed in baled, ground, or pelleted form was traced with brilliant-green-dyed hay through the digestive tract of dairy heifers. The amounts of dry matter found in the entire digestive tract represented 194.2, 175.7, and 110.9% of the previous 24 hr intake of baled, ground, and pelleted hays, respectively. Reticulo-ruminal dry matter recovery represents 75.5, 69.3, and 57.5% of the total found in the entire digestive tract. The more rapid disappearance of pelleted hay from the reticulo-rumen failed to influence the quantity or the length of retention of the digesta posterior to the reticulo-rumen.

Recovery of dyed hay followed the same trend, with 91.4, 84.6, and 67.9% of that recovered being found in the reticulo-rumen for baled, ground, and pelleted hay, respectively. Initial appearance of dyed hay in the feces occurred in the 17- to 20-hr collection period with baled hay, in the 13- to 16-hr collection period with ground hay, and in the 0- to 12-hr collection period with pelleted hay. These data indicate the more rapid passage of both ground and pelleted forage through the digestive tract and would appear to explain the decrease in digestibility of these two forms of hay found at this station.

FOOTNOTES

1 Technical Contribution No. 405 South Carolina Agricultural Experiment Station, Clemson College, Clemson, S. C. Published by permission of the Director.






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Copyright © 1963 by the American Dairy Science Association ®.