We’re talking TBs, correct? You can get this info through Equineline: both for free (more difficult) or by paying for a report (easy, but obviously costs $).
To get the info for free for any TB stallion with JC registered foals:
-Go to http://www.equineline.com/
-On the right hand side of the screen where it says Free 5 cross pedigree, click on “hypothetical foal”
-Enter the sire
-Enter any registered TB dam (dead, alive… whatever, you can put Zenyatta)
-On the next page, make sure “Include interactive nicking” is checked (you can choose other info if you’re so inclined but it’s not necessary)
-On the second page of the pedigree, it will include the sire’s stats for all foals of racing age (2 and up). If a stallion is currently active, realize his most recent two crops won’t be represented in that number. But pensioned or deceased stallions will show a number that represents all of their lifetime get.
Another way to access this info for free is if a stallion is active and his connections have paid for a subscription to his equineline “Statistical Summary.” They usually make this link public on the horse’s website or Bloodhorse page. Not all stallion owners pay for this, but you can find it for any of the active big names. For example, you can find the link on Curlin’s Bloodhorse page under “tools and resources” in the middle of the page. Here’s what the report looks like:
http://www.equineline.com/extendedcontent/bh.cfm?StallionRef=7147650&rtype=stats&ASCID=1443262
For non-TBs, Sporthorse-Data shows this info at the top of the page when you search for a stallion… but its accuracy is limited since it is user-maintained.