Need Genetics For Horses

As a big horse person I was super excited when the Horse Ranch pack came out. I spent a lot of my time breeding horses on the sims 3 to see what kind of foals I could genetically have. I am very disappointed that for the sims 4 horses genetics for coat patterns is pretty much non-existent. I am really hoping for some kind of update to remedy the issue.. I probably would not have purchased the pack at all if I had known it's just copy/paste when having a new foal. 😮‍💨