The experiment was carried out from 1982 to 1989 on 318 Corriedale ewes on their F¹ crosses with prolific rams i.e. East Friesian, Finnish and Polish „Wrzosówka". The following traits were analyzed: wool production and staple length at the age of 12 months, wool production at the age of 2, 3, 4, and 5 years, and fleece quality of two-tootched ewes. The progeny of Corriedale type ewes crossed with prolific rams had decreased (P≤0.01) wool production, e.g. the lowest fleece weight and increased staple length and wool thickness was found in the progeny descended from the Polish „Wrzosówka" rams. Crossing decreased (P≤0.01) the fleece quality (according to the appraisal method) in the progeny of Finnish and Polish „Wrzosówka" rams. However, the fleeces of the progeny of Friesian rams were better (P≤0.01) than those of the control group.