Add the 12 cup chicken broth. Bring to boiling; reduce heat. Cook, uncovered, over medium-high heat for 6 to 8 minutes or till most of the liquid has evaporated (measures about 2 tablespoons), stirring often. Whisk in the whipping cream and sour cream. Cook, whisking constantly, over medium heat for 5 minutes or till mixture thickens and is reduced to about 1 cup. Return pheasant or chicken pieces to skillet; heat through.