| Name | Color | Sex | Year of birth | Microchip | Sire | Dam | Breed | Breeder |
|---|---|---|---|---|---|---|---|---|
| Urugvay | bay | c | 1996 | 3935 Guron | 020530 Udal | anglo-rysistaya pomes | Gestut "Rjasanski" | |
| Urugvay | bay | c | 2022 | 900217000508531 | 012826(А) Can Anyone Explain | 028059(Ф) Univyersalnaya | French Trotter | Makarevich Georgy Vasilevich |
| Uryuk | bay | c | 1991 | 011001(А) Restless Spirit | 020530 Udal | Trotter | Gestut "Rjasanski" | |
| Uryupinsk | c | 2011 | 011224(А) Armbro Leaf | 025210 Usobitsa | Trotter | Stud-farm "LAG-Servis+" | ||
| 05135 Usadba | br. | f | 1936 | 01349 Graviy | 02558 Udalaya | Trotter | k.z. "Kultura" | |
| Usadba | bay | f | 2000 | 011326(А) Bullfinch | 021662 Uvertyura | Trotter | "Aleksandrovsk Stud N 12" | |
| Usan | grey | c | 1982 | 010149(А) Centennial Way | 016548 Udal | Trotter | Gestut Moskowskiy N 1 | |
| Usan | bay | c | 1986 | 010702(А) Yankee Chicano | 020539 Ulybka | Trotter | "Aleksandrovsk Stud N 12" | |
| Uschi Rich | bay | f | 2002 | Viking's Way | Ottey Rich | French Trotter | Germany | |
| Userdnaya | bay | f | 1987 | 011001(А) Restless Spirit | 020527 Uverennaya | Trotter | OKZ VNIIK |