The board, any member thereof, or any special agent or examiner designated by the board, shall hold such hearings at the Capitol or elsewhere, as the board deems necessary or appropriate to carry out the provisions of this act: Provided, however, That all hearings for the fixing of prices for milk shall be held before one or more members of the board. Each witness required to attend before the board, any member thereof, or any such special agent or examiner, under the provisions of this section, shall be entitled to the fees and mileage customarily paid to witnesses in the courts of Dauphin County. All such hearings shall be governed by such rules, regulations and orders as shall be adopted and prescribed by the board.