UNCLE'S LASSIE f. 1916
- , by

UNCOMMITTED (USA) f. 1974
BUCKPASSER (USA) - LADY BE GOOD (USA), by BETTER SELF (USA)

UNDAUNTED (FR) f. 1924
TEDDY (FR) - PERSISTENT (FR), by SPEARMINT (GB)

UNDENIABLY (USA) f. 1987
IN REALITY (USA) - PAST FORGETTING (USA), by MESSENGER OF SONG (USA)

UNDERGRADUETTE (GB) f. 1940
RHODES SCHOLAR (GB) - BRUNETTE (GB), by SON-IN-LAW (GB)

UNDERSTANDING (USA) c. 1963
PROMISED LAND (USA) - PRETTY WAYS (USA), by STYMIE (USA)

UNDINA (BRZ) f. 1970
BURPHAM (GB) - ANTELOPE (GB), by PRINCE CHEVALIER (FR)

UNE AUTRE ETOILE (BRZ) f. 2008
NORTHERN AFLEET (USA) - KEN DE SARON (USA), by KENMARE (FR)

UNE ETOILE (BRZ) f. 1993
LEGAL CASE (IRE) - LUSIMAR (BRZ), by FALKLAND (GB)

UNE IDYLLE (FR) f. 1983
KENMARE (FR) - LOVE LAND (BRZ), by KAUTOKEINO (BRZ)