J. Anim Sci.
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J. Anim Sci. 1983. 57:1576-1583.
© 1983 American Society of Animal Science
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Influence of Niacin Supplementation and Nitrogen Source on Rumen Microbial Fermentation1

D. R. Shields2, D. M. Schaefer3 and T. W. Perry

Purdue University, West Lafayette, IN 47907

Abstract

A semicontinuous culture technique was used to investigate the influence of niacin supplementation and an N source, either NH4Cl or a soybean meal-like mixture of crystalline amino acids (AA), during a series of 6- or 24-h in vitro fermentations. Establishment of rumen-like fermentations was confirmed by low H2 concentrations and relatively normal proportions of acetate, propionate and butyrate after 3 d of incubation. Niacin supplementation (100 ppm) increased (P<.05) microbial protein synthesis (control, 7.70 vs niacin, 13.69 mg protein/g substrate added) and niacin concentration (control, 9.2 vs niacin, 16.3 µg/g spent culture) regardless of N source and length of incubation. Total pyridine nucleotide pool concentration was increased (P<.05) by niacin supplementation regardless of N source during the 6-h incubations and by using NH4Cl as the N source during the 24-h incubations. Ammonia concentration, total gas or methane production, pH, free tryptophan concentration, tryptophan content of microbial protein or total VFA production were not influenced by either N source or niacin supplementation. Under the conditions of this investigation, the semicontinuous culture technique was useful in establishing rumen-like fermentations, and under those conditions niacin supplementation increased the efficiency of microbial protein synthesis.

Footnotes

1 Journal Paper No. 9019, Purdue Univ. Agr. Exp. Sta., Dept. of Anim. Sci.

2 Present address: Real Veal, Inc., Ixonia, WI 53036.

3 Present address: Dept. of Meat and Animal Sci., Univ. of Wisconsin, Madison 53706.






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Copyright © 1983 by the American Society of Animal Science.