we lost a foal just a couple of weeks ago , the mare was 270 days , the cord was very twisted (red and white colt) and we measured it at 54 cms , I dont know if thats long or average as Ive never taken much notice before , I did read about a study done in TB and the normal length for them is between 35 cms and 84 cms this mare did the same thing lastt year - premmie red and white filly , three years ago she did deliver a bay pinto colt full term , he was badly presented but we did manage to get him out ( he won all- ireland champion foal that year) all three foals were by different stallions , one point - this mare is 0nly 33 ins at the withers but she is quite a wide roomy mare , I did wonder if that was a factor - more room to move around and get in trouble