If you have dirt numbers on the horse, you should look at the relationship between the two TGIs. If a sire has a 2 point better TGI on grass, it doesn\'t mean his runners will automatically run 2 points better, but it means in general they tend to prefer grass.
I\'ve gone over the following in seminars at Saratoga, but let me cover this quickly-- in terms of trying to gauge ability, the dam side info, if there are relatives that have run, is much more important than the sire stats. Because one stallion can cover so many mares a year,only (roughly) the top 2% of males are bred a year, compared to close to 100% of the females. This means there is a much wider spread in \"ability\" in the broodmares-- there are some mares that will never throw a horse that can break 10 no matter who they are bred to. All stallions in that small band are capable of siring a good horse-- the biggest difference is in the books of mares they get, though obviously some will do better than others given equal opportunities.
What the Sire Profiles are extremely useful for is finding characteristics of the stallions, which is why we call them profiles. Because there is a much larger sampling for the sires than the mares,it\'s easy to track things like affinity for grass,precociousness and rate of development, although I look at the dam-side data to try to address those questions as well.
One of the projects we will be undertaking over the months to come will be to develop the breeding data in some new directions.
