The Jockey Club has updated the Principal Rules and Requirements of The American Stud Book following approval by the board of stewards of The Jockey Club. While the changes apply to various parts of the rule book, the more noteworthy changes were made to support the Registry's operations and customers' interactions with the Registry in connection with the increased use of digital certificates of foal registration, which started with the 2018 foal crop. The glossary of terms was expanded to include Certificate Manager and rules 2, 7, and 21 include...