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1. a male parent, esp of a horse or other domestic animal
2. a respectful term of address, now used only in addressing a male monarch



in animal breeding, a male (bull, stallion, boar, ram) used for obtaining offspring. Artificial insemination enables a single valuable sire to produce hundreds or thousands of offspring a year. For pedigree use, sires are selected from highly productive fertile parents and are evaluated on the basis of their ancestors; they must have a proper conformation, good health, and resistance to disease. In the process of pedigree use they are evaluated on the basis of their progeny. A sire whose offspring excels its parents in productivity and pedigree qualities is considered an improver. Especially valuable are sires that consistently transmit valuable properties to their offspring. In the USSR the best sires are kept at centers where pedigree work is conducted and artificial insemination is performed. The semen of sires is exchanged between countries.

References in periodicals archive ?
Giant's Causeway's brother, the Group 2-placed Freud (98, Storm Cat), is not in that league but has sired two Grade 1 winners from relatively limited opportunities and features regularly among the leading New York sires.
Another half-brother, Honor Grades (88, Danzig), sired the Breeders' Cup Distaff heroine Adoration.
Now 15, Slicky has sired eight stakes winners, including Gris De Gris, a Group 2 winner now based at the French National Stud who sits in third behind Dalakhani on the leading French sires' list.
Mtoto sired 329 winners on the Flat from 645 foals of racing age, including 27 black-type winners.
Barefoot Lady Footstepsinthesand (sire) - Lady Angharad (Tenby) Breeder: Arbawny Ventures 2000 Sales history: not sold for 9,500gns at Tattersalls October Book 2, bought by Gill Richardson for EUR30,000 at the Goresbridge breeze-up Sire won the 2,000 Guineas and sired last year's close 1,000 Guineas fourth Sent From Heaven and French 2,000 Guineas third Shamalgan from his first crop; dam precocious (won the Woodcote Stakes at two), but progressed into a useful 1m2f performer at three to four.
A notable if not oustanding racehorse in Europe, El Prado has sired some high-class racehorses such as Medaglia D'Oro, himself the sire of great filly Rachel Alexandra, globetrotter Spanish Moon and Breeders' Cup Mile winner Artie Schiller.
His deceased son Old Vic sired Gold Cup winner Kicking King and Grand National heroes Comply Or Die and Don't Push It.
Alflora sired the most winners of the British-based stallions with 38, followed by Kayf Tara's 36, Overbury on 29, Dr Massini's 28 and Midnight Legend in fifth with 27.
The eight-year-old is one of just 16 foals from the third crop of Prix Royal-Oak winner Tiraaz, a short-lived son of Lear Fan who sired only 66 registered foals during his three seasons at Ballycurragh Stud in Ireland.