Allotments of state aid under this article may be made for awarding of prizes for livestock shows; provided, that such awards shall be made only for the purpose of awarding prizes and premiums at shows sponsored by the state Department of Agriculture and Industries, and then only to match an equal amount provided for that purpose by subscription of private persons, firms or corporations. Allotments of state aid under this section shall not be made to any livestock show or other similar organization if such organization is organized for pecuniary profit of any individual, firm or corporation or if such organization pays monetary dividends to any individual, firm or corporation.