Most Tall Fescue (Festuca arundinacea) is infected with a fungal endophyte. The endophyte produces toxins that cause a number of problems for grazing animals, though sheep appear to be less affected than cattle and horses. However, sheep are prone to “fescue foot,” hyperthermia, poor wool production, and reproductive problems, as well as lowered feed intake and the resulting poor weight gains. Diluting Kentucky 31 tall fescue with legumes and supplementing with other feeds will reduce the toxic effects of fescue on livestock. Alternative tall fescue cultivars are also available. Stockpiled fescue is less toxic.