When we started in 1999 a big horned cow came in around 50ttt. Now if they don't hit 50ttt at two years of age, we move on. Great genetics abound and so do colors. We must have good dispositions or they leave the ranch. We have several 80 and 90 ttt ladies. All the bulls over 80 ttt...and it looks like a young lady named Silver Heart will be our first 100 ttt cow possibly by the time she is 5 years of age.