Barr started out as a cattle breeder until in 1961 he bought a yearling colt subsequently named Welton Gameful. His progeny became so successful that Barr sold the dairy herd to concentrate on horse breeding and so started the Welton Stud that is now represented throughout the world. Three horses bred by Barr and his wife Linda, competed at the 1995 European Championships in Pratoni (Italy) which was won by the mare Welton Romance. He has also bred the winners of three four-star events; Welton Greylag - Burghley 1991, Welton Houdini - Badminton 1993 and Welton Envoy - Lexington 2000.
"Sam has competed at top level, bred many successful event horses that have represented Great Britain, supported riders and been instrumental in raising awareness of the importance of breeding," said Mike Etherington-Smith, Chief Executive of British Eventing (BE).
Despite being in his 90th year, Sam, supported by his wife Linda, is still very much involved in breeding and currently owns the eventing stallion Welton Double Cracker, who is ridden by Matthew Wright.