J. Anim Sci.
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J. Anim Sci. 1985. 61:1253-1263.
© 1985 American Society of Animal Science
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Effect of Supplemental Niacin or Niacinamide and Soybean Source on Ruminal Bacterial Fermentation in Continuous Culture1

S. M. Hannah2 and M. D. Stern

University of Minnesota3, St. Paul 55108

Abstract

Effects of niacin or niacinamide in diets containing either soybean meal, raw whole soybeans or whole soybeans extruded at 132 and 149 C on ruminal bacterial fermentation were examined with a dual-flow continuous culture system. In Exp. 1, soybean sources each provided 50% of total crude protein in diets comprised of 52% concentrate mix, 36% corn silage and 12% alfalfa hay (dry-matter basis). Each diet was supplemented with 0 or 100 mg/kg niacin. Niacin supplementation increased (P<.05) total nonstructural carbohydrate digestibility and lowered (P<.05) butyrate concentration. There was also an increase (P<.10) in amino acid effluent flow from 8,413.3 to 8,665.3 mg/d with addition of niacin to the diet. In Exp. 2, diets were supplemented with 0 or 100 mg/kg of niacin or niacinamide. The total mixed diet was comprised of 60% concentrate mix, 20% corn silage and 20% alfalfa hay (dry matter basis). Acid detergent fiber and cellulose digestibilities and total amino acid effluent flow were higher (P<.10) with niacinamide supplementation. Niacin or niacinamide had no effect on dry matter and organic matter digestibilities, ammonia-N, total VFA concentration or crude protein degradation. Contrary to results found in other studies, niacin or niacinamide supplementation had no effect on bacterial protein synthesis.

Footnotes

1 Published as Paper No. 14,257 of the Scientific Journal Series of the Minnesota Agr. Exp. Sta. on research conducted under Minnesota Agr. Exp. Sta. Project No. 16-048, supported by the College of Agriculture, Triple "F" Feeds, Des Moines, IA and Degussa Corp., Teterboro, NJ.

2 Present address: Anim. Sci. Dept., Univ. of Missouri, Columbia 65211.

3 Dept. of Anim. Sci.






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Copyright © 1985 by the American Society of Animal Science.