It’s difficult to think of the Kentucky Derby without longtime trackside commentator Donna Barton Brothers. The former jockey, who’s been a beloved part of NBC’s Kentucky Derby coverage since the network acquired the rights to the race in 2001, announced she’s retiring after this year’s Run for the Roses on Saturday. “I told Lindsay Schanzer, our producer, that I definitely wanted to make it to Kentucky Derby 151 because that would be my 25th Kentucky Derby,” said Brothers, who turned 60 on April 22. Longtime trackside commentator Donna Barton Brothers announced she is retiring after 26 years. Instagram/Donna Barton Brothers “But if I had my druthers, I would also like to make it to Derby 152 because then I’ll be 60 years old and I’ll feel like I’ve earned the right to retire. So now I have two careers behind me. I retired from being a jockey in 1998.” Brothers’ heartfelt interviews with the winning jockey just seconds after crossing the finish line helped her to become a fan favorite.…