Artificially propagated upland game birds released on licensed shooting preserves may be taken during the shooting season provided in this act but the total number taken on any shooting preserve during any such season shall not exceed eighty-five per cent (85%) of the total number of the individual species of said birds released thereon during the license year. Provided, however that, in addition to the authorized taking of upland game birds, one hundred per cent (100%) of exotic species not established and classified as game birds in this state may also be taken under the provisions of this act. Shooting preserve operators may provide their own shooting limitations and restrictions as to the sex and number of those species that may be taken by shooting preserve hunters. All birds released under this act shall be at last [least] fourteen (14) weeks of age before liberation and must possess full plumage.