21—64.81 (163) Tuberculin reactors. All herds of breeding cattle in counties that are under state and federal supervision for the eradication of tuberculosis in which reactors have been found may be held in quarantine until they have passed a negative tuberculin test.
All cattle that react to the tuberculin test, as well as those which show physical evidence of tuberculosis, shall be marked for identification by branding with the letter “T” not less than two or more than three inches high on the left jaw and to the left ear shall be attached a metal tag bearing serial number and the inscription “REACTOR”.
This rule is intended to implement Iowa Code section 165.4.