At such hearing, if satisfied that a majority of the landowners owning more than fifty percent (50%) of the land in said proposed herd district who are resident in, and qualified electors of, the state of Idaho are in favor of the enforcement of the herd law therein, and that it would be beneficial to such district, the board of commissioners shall make an order creating such herd district, in accordance with the prayer of the petition, or with such modifications as it may choose to make. Such order shall specify a certain time at which it shall take effect, which time shall be at least thirty (30) days after the making of said order; and said order shall continue in force, according to the terms thereof, until the same shall be vacated or modified by the board of commissioners, upon the petition of a majority of the landowners owning more than fifty percent (50%) of the land in said district who are resident in, and qualified electors of, the state of Idaho.