Can the GDT Report explain how different matings to the same mare can produce such divergent results?

Yes. The GDT Reports below feature two matings to the same mare, a champion racehorse. The mare's family itself has a consistent color pattern of pink, orange, and gold - colors from slightly to the right of center of the bell curve.

The "consistent" mating on the left was to a stallion of similar size (note gold for stallion size and pink for his predominant progeny). This mating resulted in a multiple Grade 1 stakes winning filly who was among the highweights for her year. Because this filly (now a broodmare) has this powerful, consistent genetic make-up, she is excelling in the breeding shed just like she did on the race track, already having produced a champion!

The second GDT Report illustrates the same mare's mating to a different stallion, one of the best in the world, but one whose family is characterized by smaller horses - to the left of center of the bell curve. The horse himself inherited the small body type of his father's family (signfied by the blue color of his personal measurement) and some very good racing abilities because he also earned championship honors. With his pedigree and race record, most figured him to be an excellent stallion candidate. But when we started measuring his offspring, we noted that they predominantly had a larger body type (signified by the pink above his own blue color) indicating that as a stallion he was not reproducing his champion-like traits in his offspring. As a result of these genetic inconsistencies, his progeny have not excelled on the racetrack. Not surprisingly, this once "hot sire," who initially had progeny in the Keeneland July Sale, now stands for a fraction of his original stud fee.

CONSISTENT	INCONSISTENT