(1)  When any fence or part thereof which before the passing of this Act has been or hereafter shall be made is out of repair or becomes insufficient, the owners of land on either side thereof shall be liable to the cost of repairing such fence in equal proportions.

(2)  When any fence or part thereof which before the passing of this Act has been or hereafter shall be made a rabbit-proof fence is out of repair or ceases to be rabbit-proof, the owners of land on either side thereof shall be liable to the cost of repairing such fence or making the same rabbit-proof in equal proportions.