| Name | Color | Sex | Year of birth | Microchip | Sire | Dam | Breed | Breeder |
|---|---|---|---|---|---|---|---|---|
| U.S. Like Clockwork | bay | f | 1974 | Super Bowl | Time Song | American Trotter | USA | |
| U.S. Sushi | d.-bay | f | 1983 | Speedy Crown | Ah So | American Trotter | USA | |
| Ua Uka | chestnut | f | 1964 | Kerjacques | French Trotter | France | ||
| Uai.I.Es. * | bay | c | 1979 | Super Bowl | Victorious Lou | American Trotter | USA | |
| Uandeful Gel | bay | f | 2008 | 012144(А) White Rif | 024837 Gertsoginya | Trotter | Kinzhibaev I.U. | |
| 028958(А) Uandmetogether As | d.-bay | f | 2015 | Muscle Mass | France Dream | American Trotter | USA | |
| Uayt Kaviar | bay | c | 2022 | 012665(А) Ens Caviar's Sun | 028239(Ф) Ursula | French Trotter | PZ "Medvedsky" | |
| 017761 Ubaida | bay | f | 1973 | 08682 Barhat | 015277 Ulybka | Trotter | kh "Avangard" Piriatinskogo r- | |
| 10583 Ubeditel | grey | c | 1972 | Orlov trotter | ||||
| Ubeditel | d.-bay | c | 2005 | 011890 Brodvey | 024175 Ufa | Trotter | OAO "Orenburgalko" |