Variation between and within Populations of Mink: II. Skin and Fur Characteristics

Abstract

Genetic and environmental sources of variation in skin and fur characteristics were estimated within and between populations in a two year mink progeny testing scheme with approximately 200 paternal progeny groups. Animals from several populations were housed at a central test station, and corresponding full-sibs were kept at the farm of origin. Data were analysed with an animal model to estimate heritabilities, common litter effects and fixed effects due to population and environment. Genetic variation within and between populations was found, together with significant environmental effects, indicating potential improvements in the breeding scheme. An interaction of sex with population and environment was considered and found significant for traits with a large sex dimorphism. Common litter effects were unimportant for traits measured, except for length and weight of skin. Discrete, subjectively measured traits are analysed with a linear model and a threshold model.