La Coocaracha was bred to be a pacer she is by Safely Kept out of Poetry but turned out to be a champion trotting mare winning $428k, Safely Kept has thrown a number of trotters out of pacing mare's. Take a look at her breeding as she has 3 live foals by trotting stallions and also 3 live foals by pacing stallions. I couldn't tell you if it has succeeded or not i just thought you could have a look at her breeding and foals as an example.