[Gonadal endocrine function in female silver foxes selected for domesticated behavior]

Area of Science:

• Reproductive endocrinology
• Animal behavior genetics

Background:

• Domestication of silver foxes has led to behavioral and physiological changes.
• Ovarian endocrine function plays a crucial role in mammalian reproduction.

Purpose of the Study:

• To investigate the endocrine changes in the ovaries of domesticated female silver foxes.
• To explore the link between ovarian hormone levels and reproductive seasonality in tame foxes.

Main Methods:

• Analysis of peripheral blood hormone levels (estradiol, progesterone).
• Assessment of gonad hormone production during anestrous.
• Comparison between domesticated and wild-type silver foxes.

Main Results:

• Significant alterations in peripheral blood estradiol and progesterone levels were observed in domesticated foxes.
• Changes in gonad hormone production during anestrous suggest an endocrine basis for altered reproductive cycles.
• Elevated hormone levels during preimplantation and pre-parturition periods were noted in tame foxes.

Conclusions:

• Altered ovarian endocrine function, specifically estradiol and progesterone levels, is associated with domestication in silver foxes.
• These hormonal shifts may explain the earlier onset and out-of-season reproduction observed in domesticated females.
• Hormonal changes during key reproductive periods could contribute to increased productivity in tame silver foxes.