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Journal of Dairy Science Vol. 59 No. 5 894-901
© 1976 by American Dairy Science Association ®
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Rumen Volatile Fatty Acids and Milk Composition from Cows Fed Hay, Haylage, or Urea-Treated Corn Silage1

D. J. Schingoethe, H. H. Voelker, G. L. Beardsley2 and J. G. Parsons

Dairy Science Department, South Dakota State University, Brookings 57006

ABSTRACT

Alfalfa-brome hay, haylage, .5% urea-treated corn silage, or .5% urea plus 1% dried whey-treated corn silage was fed as the only forage to one of four groups of 10 lactating cows per group for a lactation trial of 10 wk. Rumen samples were collected via stomach tube 3 to 4 h after the morning feeding. The pH of the rumen samples from cows fed hay was higher than for cows fed haylage, urea-treated corn silage, and urea-whey corn silage, 6.69 versus 6.36, 6.40, and 6.50. Total volatile fatty acids and propionate were highest from cows fed urea-whey corn silage and were higher on all three fermented forages than cows fed hay. Acetate/propionate ratio was highest from cows fed hay and lowest from cows fed corn silages. Butyrate was highest from cows fed haylage or hay. Milk protein composition was not affected by ration although nonprotein nitrogen of milk was highest from cows fed the urea-treated corn silages. Oleic acid and total unsaturated fatty acids were lowest in milk fat from cows fed hay while palmitic acid was highest from cows fed hay and haylage. These results suggest that type of forage fed may cause small changes in rumen fermentation and in milk composition. The importance of these changes is unknown but may affect properties of dairy products produced from this milk.

FOOTNOTES

1 Published with the approval of the Director, South Dakota Agricultural Kxperiment Station as Publication No. 1380 of the Journal Series.

2 Department of Dairy Science, University of Wisconsin, Madison 53706.






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Copyright © 1976 by the American Dairy Science Association ®.