Early growth and carcass traits of cattle containing Simmental, Angus and Hereford breeding

Performance of 543 (birth) to 153 (carcass) calves raised on 3-year-old and older Hereford dams was analyzed using least-squares procedures.Analyses of variance generally included year, breed group, sex, age of dam, appropriate two-factor interactions and appropriate covariates.Data were collected during the years 1976 through 1979 at the Northern Agricultural Research Center near Havre.Breed groups studied were 50% Simmental-50% Hereford (ISIH), 25% Simmental-75% Hereford (1S3H), Angus-Hereford (AH) and straightbred Herefords (HH).Special thanks are extended to Don and Nancy Burnham for providing semen from the crossbred bulls and the Curtiss Breeding Service for a semen grant.Gratitude is also expressed to Donald C. Anderson, Daniel E .Doornbos and the staff of the Northern Agricultural Research Center Havre, Montana.fortheir assistance with data acquisition.