Physiology And The Kentucky Derby

—- NPR's Joanne Silberner reports on the physiological limits that keep thoroughbred horses from running faster than they already do. The 123rd Kentucky Derby will be run tomorrow...during the past 20 years of the race, winning times have remained remarkably constant. Owners say they may have reached the limit in breeding horses selectively for speed.



Please keep your community civil. All comments must follow the Community rules and terms of use, and will be moderated prior to posting. NPR reserves the right to use the comments we receive, in whole or in part, and to use the commenter's name and location, in any medium. See also the Terms of Use, Privacy Policy and Community FAQ.