41 (2000) 254 - 258; and B. Wallin - Hakanson, N. Wallin - Hakanson, A. Hedhammar, Influence of selective breeding on the prevalence of chorioretinal dysplasia and coloboma in the rough collie in Sweden, J.
Small Anim.
Second, there is strong data documenting segregation distortion in the transmission of CEA (see: B. Wallin - Hakanson, N. Wallin - Hakanson, A. Hedhammar, Collie eye anomaly in the rough collie in Sweden: genetic transmission and influence on offspring vitality, J.
Small Anim.