Ю. А. Березина This study investigates morphometric variability in female silver-black foxes (n=50/age group) at 3 and 7 months of age, conducted at OOO “Fur Farm Vyatka”. The study aimed to analyze the age dynamics of body structure and identify key factors determining growth during critical developmental periods. Principal Component Analysis (PCA) was employed to process data for 13 linear and weight parameters. The results revealed two main factors that collectively account for 76.8% of the total trait variability. At three months of age, the total body size factor dominates (49.99% of the variance), integrating the growth of all linear traits (body length: 0.922; tail length: 0.897; chest girth: 0.881; body weight: 0.828). This pattern is characteristic of isometric growth during early ontogenesis under the control of the somatotropic axis (GH-IGF-1). By seven months, the structure of variability changes fundamentally. The first component (39.60%) reflects the prioritized development of axial structures, while the second component (33.67%) demonstrates allometry, contrasting chest width (0.937) against forelimb length (–0.889) and head length (–0.786). It was established that these changes are a direct consequence of hormonal shifts: estrogen activation inhibits the linear growth of limbs while stimulating the development of the trunk backbone and the accumulation of energy reserves. This transition represents an adaptive strategy aimed at preparing the female organism for its first reproductive cycle. The findings have practical significance for optimizing the management and nutrition of young fur-bearing animals in commercial fur farming.
Научная статья 
онтогенез