Fast Facts -- What is the Average Earnings Index (AEI) in Thoroughbred Breeding?

Theorien zur Vollblutzucht ??? Wikipedia – Enzyklop??die

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Is This a Broodmare -- Stakes-Winning Stroll Filly Runs for a Tag

The Five-Cross Files — Fri, 31 Jul 2009 18:43:29 GMT

Great female family? Check. Up-and-coming sire? Check. Multiple winner? Black type? Available for cheap? Check, check, and check.

Fast Facts -- What Is the Comparable Index (CI)?

The Five-Cross Files — Wed, 29 Jul 2009 21:24:40 GMT

The Comparable Index is a tool that helps evaluate how strong a stallion's book of mares is -- either from year to year, or compared to other sires in a given year. It has many applications -- and I include an example of how commercial breeders might

re: Fast Facts -- What is the Average Earnings Index (AEI) in Thoroughbred Breeding?

Novanora — Sun, 26 Apr 2009 03:39:36 GMT

The AEI along with the CI is one of my favorite statistics. Don't you love stallions whose AEI is higher than the CI? Granted, at the bottom levels, it may not mean much, but at the mid-level, it can really make or break a stallion.

re: Fast Facts -- What is the Average Earnings Index (AEI) in Thoroughbred Breeding?

sceptre — Wed, 22 Apr 2009 02:39:43 GMT

Nice explanation of AEI... As you say, this index is not without its flaws. If Estes devised this with an intent "... to allow comparison of stallions from one generation to the next..." it is not, in my opinion, a particularly accurate tool. I had noticed that prominent stallions of the (ex.) 30s and 40s, and a bit on to the 50s had, in general, AEIs significantly lower than those of the 60s, 70s & 80s. More recently, however, prominent stallion AEIs have decreased relative to those of the more recent past. The reason for these disparities likely differ. In the earlier case it was probably due to the increased % disparity of purses. The more recent cause is attributed, by some, to increased crop size of prominent stallions (relative diluted strength of mates). In general, however, AEI serves to further the self fulfilling prophesy dynamic in stallion performance evaluation. Those initially perceived as "better" receive the better mares so, all else equal, they should sire better (higher earning) racehorses. The AEI then reflects these higher earnings/offspring in a simple concrete form = (to some) relative worth. The CI, which supposedly is offered to reflect quality of mates is inherently more flawed yet (long story). Lastly, as I understand it, lifetime stallion AEIs are determined by averaging the stallion's yearly AEIs. This rationale is simply wrong-headed and rather easily remedied.