We use the long-necked Z-tags on our calves. Each tag has a top number, which is in the chronological order in which they were born, and the bottom number matches the calf's mother's number. Our Spearhead brand <- fits nicely between the numbers. Blue tags designate the Kosmo Kid's kattle; calves from two-year-old heifers (1 on the year brand) get yellow tags; calves from three-year-old cows (0 on the year brand) get pink; calves from (9) cows get white; ( 8 ) red; (both 6 and 7 year brands) orange; (5) green; (4, 3, and 2 year brands) get purple. It's a bit complicated but works like a dream because we are used to it. :wink: