Miss. Code § 69-13-205
The respective boards of supervisors of the several counties of the state, in their discretion, are authorized and directed to erect, construct and maintain suitable fences and cattlegaps along the right of ways of United States Highways and state designated highways to prevent livestock from running at large as provided hereinafter. However, nothing in this article shall apply in any county coming under the state stock law.
The board of supervisors in any county having voted to come within the provisions of the statewide stock law, may maintain any fence or fences constructed under the authority of this article from any funds not public funds, donated by any person, firm or corporation for said purposes and further, may receive and accept funds from the Mississippi State Highway Commission for the relocation of said fence or fences required by said commission. In its discretion and in the alternative, said board may authorize any person, firm or corporation to maintain said fence or fences.
Miss. Code § 69-13-205