A fillie's father is called a sire, same as a colt's. And just for the record their mother is called their dam.
Minnesota Fillies was created in 1978.
Fillies' Mile was created in 1973.
Fillies' Sprint Stakes was created in 2002.
Portland Fighting Fillies was created in 2010.
Chartwell Fillies' Stakes was created in 1994.
A group of young female horses is called a "herd of fillies".
Breeders' Cup Juvenile Fillies was created in 1984.
Denny Cordell Fillies Stakes was created in 1996.
Breeders' Cup Juvenile Fillies Turf was created in 2008.
Kentucky Cup Juvenile Fillies Stakes was created in 1994.
Yes, the first Kentucky Derby included fillies among its participating horses. There were 13 colts and two fillies. The two chestnut fillies were Ascension and Gold Mine.Ascension placed 10th. She was ridden by Billy Lakeland, the only white rider among a total of 15 jockeys.Gold Mine finished last. She was ridden by Stradford.
Del Reeves recorded a song called 'Philadelphia Fillies' in 1971.