By Bill Oppenheim
As we have mentioned before, once a horse shows up as an A Runner on one of our annual lists it goes into a separate file, which we call 'Unique' A Runners, where they are only counted once, whereas in the rolling 7-year APEX files, a horse is counted once every year it reaches the A Runner earnings threshold, meaning in theory it could be counted as up to seven A Runners over a seven-year period. Today we focus on a list of 16 North American and European sires which have emerged as the leaders among three crops of…
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