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 U.S. Dairy Forage Research Center: Madison, WI
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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
                                            Muck, Richarditem
                                            Powell, Josephitem
                                            Russelle, Michaelitem
                                            Mertens, Daviditem
                                            ROTZ, C - PSWM RESEARCH LAB
  Submitted to: Meeting Abstract
                                    Publication Type: Abstract Only
                                    Publication Acceptance Date: 10/21/2001
                                    Publication  Date: N/A
                                    Citation: N/AInterpretive Summary:
                                Technical Abstract: Plant breeding and biotechnology efforts are underway in the U.S. and abroad to develop alfalfa and other forages with modest amounts of condense d tannins.  Tannins bind to proteins, potentially altering N availability in forages during ensiling, ruminal digestion, and soil mineralization. We used a whole-farm dairy-forage simulation model (DAFOSYM) to predict  the effect of growing and feeding an alfalfa with 1 to 2% tannin on a dair farm in southern Wisconsin with 100 cows, 85 heifers, and 100 ha of silt loam soil.  Alfalfa silage and corn silage were produced and fed in ratios of 2:1 or 1:2.  Crop yields were similar when normal or tannin-containing alfalfa were grown.  Feeding tannin-containing alfalfa reduced farm profitability by $9,500 to $15,600 per year.  Benefits were greatest in alfalfa-dominant production systems.  Feeding tannin-containing alfalfa shifted grain supplementation from soybeans to corn, reducing the need for  off-site production of potentially erosive and nitrate leaky row-crops by about 60%.  Our current research is aimed at identifying optimal tannin concentrations and management practices for enhancing protein and N use on dairy farms.


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