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The APEX (Annual Progeny Earnings index) method of rating stallions uses many of the same basic principles as the average-earnings index, but rates a stallion’s consistency at siring high-level performers, so that one super-earner doesn’t unrealistically skew a sire’s average-earnings index. There are many ways of looking at the statistic–each sire has 17 different APEX ratings–including progeny performance at different ages, by different class bands and in different regions. Stallions can also be measured against only those whose crops hit the track in the same year. Each week, beginning this week, the TDN will offer a different APEX snapshot with a brief analysis by APEX’s author, Bill Oppenheim.