4 The Producer Board is authorized, in relation to the powers granted to it by section 3 with respect to the marketing of hogs in interprovincial and export trade, to make orders fixing, imposing and collecting levies or charges from persons described in section 3 who are engaged in the production or marketing of hogs and for such purpose classifying such persons into groups and fixing levies or charges payable by the members of the different groups in different amounts; and the Producer Board may use such levies or charges for its purposes, including the creation of reserves, the payment of expenses and losses resulting from the sale or disposal of hogs and the equalization or adjustment among producers of hogs of moneys realized from the sale thereof during such period or periods of time as it may determine.
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