If livestock are branded by the owner, they shall be branded as follows: Neat cattle, horses, mules and asses shall be branded before they are twelve months old; hogs, sheep and goats shall be branded before they are six months old. The ages specified herein shall not apply to livestock which have passed those ages at the time they are acquired by the owner or at the time the owner is granted a brand under this article; but all such livestock, if branded by the owner, shall be branded within one month after the time they are acquired by the owner or the time the owner is granted a brand under this article.