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Journal of Dairy Science Vol. 72 No. 9 2427-2430
© 1989 by American Dairy Science Association ®
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Deactivation of Tannin in High Tannin Milo by Treatment with Urea1,2,

R. W. Russell3 and J. R. Lolley4

Department of Animal and Dairy Sciences, Auburn University, AL 36849

ABSTRACT

Experiments were conducted to determine the effectiveness of urea in deactivating tannin in high tannin milo. High tannin milo (Pioneer B 815, 3.4 ± .3% tannin) was reconstituted with aqueous urea solutions to give combinations of 26, 30, and 34% moisture with 2, 3, and 4% urea (percentage of urea per dry weight of milo). All treatments were maintained at 25°C and were effective in deactivating tannin with no differences among moisture or urea content. The average rate of tannin deactivation was 68 ± 2% d–1. Temperature affected rate of tannin deactivation in milo reconstituted to 30% moisture and 3% urea when stored at 25 or 60°C. Rate of tannin deactivation was 44 ± 5 and 89 ± 18% d–1 at 25 and 60°C, respectively. Tannin in high tannin milo can be deactivated rapidly and completely by reconstitution with aqueous urea. These studies demonstrate that tannin is deactivated completely under conditions where urea is an effective preservative of high moisture milo.

FOOTNOTES

1 Journal Article Number 4-881681P of the Alabama Agricultural Experiment Station, Auburn 36849. Project Number 00655.

2 Research was partially supported by Columbia Nitrogen Corporation, Augusta, GA, and Alabama Farmers Federation, Montgomery, AL.

3 Present address: Division of Animal and Veterinary Sciences, West Virginia University, Morgantown 26506-6108. To whom reprint requests should be addressed.

4 Present address: USDA Parasitology Laboratory, Auburn, AL.






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Copyright © 1989 by the American Dairy Science Association ®.