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Journal of Dairy Science Vol. 71 No. 5 1239-1247
© 1988 by American Dairy Science Association ®
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Effects of Niacin and Whole Cottonseed on Ruminal Fermentation, Protein Degradability, and Nutrient Digestibility1

J. L. Horner2, C. E. Coppock, J. R. Moya, J. M. Labore and J. K. Lanham

Department of Animal Science, Texas A&M University, College Station 77843

ABSTRACT

Four mature nonlactaring Holstein heifers fitted with ruminal and duodenal cannulae were used to investigate in vivo effects of niacin and whole cottonseed. Each heifer was assigned randomly to a treatment in a 2 x 2 factorial arrangement of treatment sequences within a 4 x 4 Latin square design. Heifers were fed isonitrogenous complete mixed rations individually twice daily. Diets contained corn-soybean meal concentrate, corn silage, chopped coastal bermudagrass hay, plus 1) 0% niacin and 0% whole cottonseed, 2) 0% niacin and 15% whole cottonseed, 3) .07% niacin and 0% whole cottonseed, or 4) .07% niacin and 15% whole cottonseed. Dry matter consumption, ruminal pH, ruminal ammonia and VFA concentrations, microbial N production, and DM and ADF digestion were not affected by treatment. Numbers of ruminal protozoa and RNA concentrations were reduced with whole cottonseed feeding and increased by addition of niacin. Whole cottonseed increased molar percentages of acetate while depressing propionate. Niacin supplementation resulted in greater digestion of both CP and NDF. Ether extract digestibility was highest in heifers fed whole cottonseed. Fiber digestion was not affected by whole cottonseed feeding.

FOOTNOTES

1 Technical Article 22711 by the Texas Agricultural Experiment Station, College Station 77843.

2 Cocanougher Feed Co., Decatur, TX 76234.






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Copyright © 1988 by the American Dairy Science Association ®.