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ARS Home Midwest Area Madison, Wisconsin U.S. Dairy Forage Research Center Research Publications at this Location





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Title:   Author  item
                                            Grabber, Johnitem
                                            Broderick, Glenitem
                                            Sullivan, Michaelitem
                                            Hatfield, Ronalditem
                                            Powell, Josephitem
                                            Rotz, Clarence

                                                         - *Al*item
                                            Muck, Richarditem
                                            EHLKE, N - U OF MINNESOTA
  Submitted to: Meeting Abstract
                                    Publication Type: Proceedings
                                    Publication Acceptance Date: 4/14/2004
                                    Publication  Date: 8/23/2004
                                    Citation: Grabber, J.H., Broderick, G.A., Sullivan, M.L., Hatfield, R.D., Powell, J.M., Rotz, C.A., Muck, R.E., Ehlke, N.J. 2004. Protein-binding polyphenols enhance nitrogen cycling and profitability of dairy farms. In: 228th ACS National Meeting, August 22-26, 2004, Philadelphia, Pennsylvania. 2004 CDROM.Interpretive Summary:
                                Technical Abstract: We are conducting systems research to characterize how condensed tannins and other forage polyphenols influence protein utilization by dairy cattle, nitrogen loss and cycling in manure and crop systems, and farm profitability. Polyphenol-containing forages undergo less proteolysis during ensiling and ruminal fermentation, providing up to 50% more forage protein for gastrointestinal digestion and absorption by cattle. In feeding trials, forages with polyphenols increased N-use efficiency or milk yields up to 15% and decreased labile nitrogen excretion in manure up to 15%. Field and laboratory trials will reveal how polyphenols influence nitrogen loss and cycling during manure handling and crop production. Preliminary farm-level simulations indicate that the use of a polyphenol-containing alfalfa on dairy farms would increase long-term farm profitability up to 12% and reduce nitrogen losses up to 25%. Because of the potential economic and environmental benefits, we are partnering with other groups to develop alfalfa with optimal polyphenol concentrations.


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