 After the death of Christopher Chenery in January 1973, Riva Ridge and his stablemate Secretariat were both sold to breeding syndicates and retired to stud at Claiborne Farm at the end of the 1973 racing season.Riva Ridge was syndicated for $5.12 million, and Secretariat for $6.08 million.Penny Chenery often came back to visit both horses, but over time Secretariat would no longer acknowledge her due to the many visitors he got.