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Turf courses are newer to American racing than their dirt counterparts, but they've become very popular with the horsemen, as turf is usually kinder to a horse's legs, and the betting public likes the challenge.
As we said before, horses are usually bred for the turf. With the globalization of the breeding industry, main European runners spend at least part of their stud or broodmare career in the States. Consequently, plenty of turf influences show up in American horses.
Turf courses are made up of a mixture of grasses on a sandy loam base, and like the dirt, have a drainage layer beneath that. Again, a chart of a few tracks and their turf mixtures.
| Track | Turf | Base |
| Del Mar | bermuda | 24" sand |
| Laurel | fescue, rye, bluegrass | sand |
| Arlington | fescue, rye, bluegrass | sand |
| Churchill Downs | fescue and bluegrass | sand |
Just like taking care of your lawn at home, certain grasses grow better in certain climates: the dry and warm California climate is conducive to Bermuda, while traditional grasses grow better in the Midwest. How a horse gets over the turf course is a matter of their personal preference as much as anything.
The Daily Racing Form includes a Tomlinson number in their past performances. The Tomlinson number was developed by handicapper Lee Tomlinson to help foretell a horse's affinity for a particular surface. The Form includes a rating for a horse at today's distance, on a wet track, and on the turf. For more on how to use Tomlinson numbers, click here: www.drf.com/misc/tomlinson.html.

Interestingly, you will see that horses with bigger feet tend to travel better on the grass than those with small feet.