| Name | Color | Sex | Year of birth | Microchip | Sire | Dam | Breed | Breeder |
|---|---|---|---|---|---|---|---|---|
| Una Salus N. | d.-bay | f | 1964 | Mario | French Trotter | France | ||
| Una Star | d.-bay | f | 2019 | 012471(Ф) Sleepy Boo | 028161(Ф) Undina LOK | French Trotter | Mr. Panin A.P. | |
| Unakit Lok | chestnut | c | 2015 | 012605(Ф) Kitko | 026725(Ф) Uberlandia | French Trotter | "Konnyy zavod "Lokotskoy" | |
| Unbelievable F. | bay | f | 2003 | Viking Kronos | Ultra Broline | American Trotter | Sweden | |
| Unciia | grey | f | 1988 | 010702(А) Yankee Chicano | 020672 Ulita | Trotter | "Aleksandrovsk Stud N 12" | |
| Unciia | chestnut | f | 1986 | 09549 Ilm | 016553 Usmeshka | Trotter | sh "Ekaterinoslavskii" Sherbak | |
| Uncle Sam | bay | c | 1957 | American Trotter | USA | |||
| Underground Spring | bay | f | 1985 | Homesick | Natural Sparkle | American Trotter | USA | |
| 02570 Undina | grey | f | 1924 | 0223 Gazavat | 01109 Umnitsa | Trotter | Elanskiy k.z. | |
| 022888 Undina | bay | f | 1994 | 010538(А) Nature Lover | 020949 Upa | Trotter | "Aleksandrovsk Stud N 12" |