Sec. 144.003.  AGE FOR MARKING OR BRANDING.  (a)  Cattle shall be marked with the earmark or branded with the brand of the owner on or before the date they are one year old.
(b)  Hogs, sheep, and goats shall be marked with the earmark of the owner on or before the date they are six months old.
Acts 1981, 67th Leg., p. 1353, ch. 388, Sec. 1, eff. Sept. 1, 1981.