Abstract
The records of wool production and body weight were obtained at first shearing time of yearling ewes on Corriedale sheep raised at the Department of Animal Husbandry, Hokkaido National Agricultual Experiment Station, Hokkaido the during the period from 1951 to 1957. They were analysed to determine the heritability estimates of greasy fieece weight, staple length, and body weight before and after shearing for this flock. The paternal half-sib correlation method was used with the records of 283 yealing ewes. The pa.ternal intra-sire daughter on dam regressions method was used with 206 pairs on which records were available on both the daughter and dam. Most of the yealing ewes were produced in the early stages of inbreeding. The average heritability estimates obtained from the paternal half-sib correlation method were O.33 and O.29 for body weight before and after shearing time, O.34 for greasy fieece weight and O. 39 for staple length. The average heritability estimates obtained from the paternal intra-sire daughter-on-dam regression method were O.33 and O.42 for body weight before and after shearing time, O.25 for greasy fleece weight and O.31 for the staple length. When the values iound by two estimated methods as above described were averaged for each four character the heritability estimates for the additive portion of the inheritance fcr these characters in this flock were O.33 and O.36 for body weight before and after shearing, O.30 for greasy fleece weight and O.35 for staple length
