Dry matter intake and feed efficiency of heifers from 4 dairy breed types grazing organic grass and grass-birdsfoot trefoil mixed pastures حسب Michael S. Greenland, Blair L. Waldron, S. Clay Isom, Sawyer D. Fonnesbeck, Michael D. Peel, Kerry A. Rood, Kara J. Thornton, Rhonda L. Miller, Jacob A. Hadfield, Bracken Henderson, J. Earl Creech

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