Not sure if this is the right place for this question but here goes.
I have a grade mare. I know the sire who is a TB. Her dam was a Percheron/TB cross and I do not know who she is. I am wondering if there is any way I can find out what Percheron lines or TB lines the dam may have come from if the dam's sire and dam were registered by doing DNA with my mare? Does the DNA testing only go back one generation and do I need the DNA of the her dam to compare? Do they even keep a DNA registration database?
Sorry if this is a nutty question..... I may be grabbing at straws to find out her dam's side.