The only member of the old board who was reappointed Wednesday was David Richardson, a horse industry veteran.
Among former members who were removed before their terms expired was Tom Conway, the father of Jack Conway, who lost to Bevin in last year's gubernatorial election.
In his executive order revamping the commission, Bevin said Kentucky's global leadership in the horse industry could diminish without quick action to improve the industry.
Bevin's order says the new commission should follow a more "focused vision" to promote safety, improve fans' experience and attract tourism and investment in the industry.
Bevin's move comes 10 days before the Kentucky Derby.
