Abstract
To estimate the genetic basis of the reproductive strategy of the sable (Martes zibellina), we performed a complex segregation analysis of the quantitative trait of average litter size. We used data on the pedigree structure and litter size. Statistical analysis suggests that the analyzed trait, defining female fertility in the reproductive period, has a normal distribution. The mixed model of inheritance was used, which assumes that the studied trait is controlled by a major gene, a polygene, and random factors. The analysis has shown that this trait is genetically determined and its inheritance can be described by the major gene model of trait inheritance. To identify the factors affecting the manifestation of the trait, we performed a variance analysis, which showed that the average litter size was influenced significantly by the sequence number of the litter, the duration of the reproductive period, precocity, and male replacement. The influence of the whelping year and the barren state of females in the middle of the reproductive period was insignificant.
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