what is blup
491 pages on this wiki. Best Linear Unbiased Prediction -- BLUP -- is a measure of a horse's training that effects the foal(s) of the horse and owner. The lowest BLUP possible is -100 which is only present in newborn foals.The highest is 100 BLUP which can be difficult, but not impossible, to achieve.ncreasing a horse's Best Linear Unbiased Prediction (BLUP) is not difficult, but it takes at least ten years of a horse's life. To attain 100 BLUP, a horse must have: 1  At least ten years of age.