Melchbourne was a British Thoroughbred racehorse and broodmare. Despite never winning a Group race, she was the top-rated filly of her generation in Britain in 1973, when she won six of her eight races, many of them by wide margins. She won once from three starts in the following year.
On her racecourse debut, Melchbourne made little impression, finishing unplaced in a maiden race at Newmarket Racecourse but then won four consecutive races against modest opposition. She recorded her first victory with a three length win in the five furlongLittle JohnMaiden Stakes at Nottingham Racecourse and followed up by easily defeating twenty-three opponents in the Quickly Plate at Windsor. She won the Palgrave Plate at Yarmouth Racecourse by seven lengths and was then moved up in distance for the July Fillies Stakes over six furlongs at Haydock Park Racecourse. She drew away from her rivals in the last quarter mile to win "in a hack canter" by an officially recorded margin of five lengths, although Timeform reported that she won by ten. Melchbourne was then moved up in class for the Princess Margaret Stakes at Ascot Racecourse in late July. She led from the start, but tired in the closing stages and finished fourth behind Celestial Dawn, Highclere and Polygamy. She then returned to Haydock for the St Nicholas Plate over six furlongs in August and produced a "brilliant display", winning by ten lengths from Rouser, a colt who went on to win the Ormonde Stakes. In September the filly was brought back in distance to five furlongs and started 11/4 favourite for the Harry Rosebery Challenge Trophy at Ayr Racecourse. She raced just behind the leaders before moving into the lead two furlongs out but began to tire in the closing stages and had to be driven out to win by three quarters of a length from the colt Daring Boy.
1974: three-year-old season
Melchbourne's three-year-old season was restricted to three races, all of them over sprint distances. On her seasonal debut at York Racecourse in May she had little luck in running and finished unplaced behind Noble Mark in the Duke of York Stakes. At Doncaster in June she was assigned top-weight of 133 pounds in a five furlong handicap race and won by half a length from Hei'land Jamie, a gelding who went on to win the Portland Handicap over the same course and distance. In July she contested the King George Stakes at Goodwood Racecourse and finished third, beaten a head and half a length by Singing Bede and Blessed Rock, after being badly hampered a quarter of a mile from the finish.
Assessment
There was no International Classification of European two-year-olds in 1973: the official handicappers of Britain, Ireland and France compiled separate rankings for horses which competed in those countries. In the British Free Handicap, Melchbourne was allotted a weight of 120 pounds, making her the equal-best two-year-old filly of the season, alongside Bitty Girl and Gentle Thoughts. The independent Timeform organisation gave her a rating of 125 and named her as their best two-year-old filly, despite awarding a higher rating to the French-trained Hippodamia. In their annual Racehorses of 1973, Timeform described her as a "thoroughly likeable and most genuine filly". In the following year she was rated on 121 by Timeform, nine pounds inferior to their best sprinter Saritamer. In the official British handicap she was rated eleven pounds behind the top-rated three-year-old filly Dibidale.
Melchbourne was retired from racing at the end of her three-year-old season and was scheduled to be covered by So Blessed. Melchbourne produced no reported foals and may have died soon after her retirement.
