Over 35,000 Thoroughbreds have now been digitally tattooed, Thoroughbred Racing Protective Bureau (TRPB) announced Thursday. The digital tattoo is an electronic authentication confirming the identity of a horse by a trained TRPB technician. "Every racing 2-year-old, every 3-year-old and a significant share of 4- year-olds have digital tattoos and by the end of 2021, we estimate that 75% of Thoroughbreds will enter the racetrack paddock with a digital tattoo," said J. Curtis Linnell, executive vice president, TRPB. "We have 56 TRPB Technicians under contract throughout the United States and Canada...