In a 3-1/2- or 4-quart slow cooker combine carrots and parsnips. In a small bowl combine orange juice, marmalade, broth, wine, tapioca, salt, and pepper. Pour over carrot mixture, toss to coat.
Cover and cook on low-heat setting for 8 to 10 hours or on high-heat setting for 4 to 5 hours or until vegetables are tender. During the last 30 minutes of cooking time, stir in orange peel, parsley and butter.