Large samples of Lambda, Sigma(1385) and Xi(1321) hyperons produced in deep-inelastic muon scattering off a ^6LiD target were collected with the COMPASS experimental setup at CERN. The relative yields of Sigma(1385)^+, Sigma(1385)^-, bar{Sigma}(1385)^-, bar{Sigma}(1385)^+, Xi(1321)^-, and bar{Xi}(1321)^+ hyperons decaying into Lambda(bar{Lambda})pi were measured. The heavy hyperon to Lambda and heavy antihyperon to bar{Lambda} yield ratios were found to be in the range 3.8% to 5.6% with a relative uncertainty of about 10%. They were used to tune the parameters relevant for strange particle production of the LEPTO Monte Carlo generator.
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