Import requirements:
Texas heifers one year of age or younger are to be officially calfhood vaccinated against cattle brucellosis prior to entering a Colorado feedlot.
If the Texas heifers are NOT vaccinated, they must enter the Colorado feedlot under a Colorado entry permit. These heifers will then be permanently identified in the Colorado feedlot by cropping the distal on third of the left ear. If heifers are NOT vaccinated, this fact should be noted on certificates of veterinary inspection issued prior to movement from Texas.
