[Study, after stopping treatment, of the consequences of the injection of male hormones in mares on their social behavior and hierarchical position].

This research investigates the effects of injecting male hormones into mares and how it influences their social behavior and hierarchical position, with the results showing that androgenization of mares can increase their social status, leading to positions that are maintained or even further improved after ceasing the treatments.

Objectives of the Research

• The research was designed to study the after-effects of injecting male hormones in equine social structures, specifically in mares.
• The scientists wanted to see how the induced androgenization impacted the mare’s social behavior as well as their positioning within the hierarchy of the group.

Method and Process

• The researchers administered male hormones into mares; some who already held a stable hierarchical position within their social group, and others recently introduced to the group.
• The treatment was subsequently stopped and the researchers observed the mares over an extended period to assess the long-term impact of the hormone injections.

Findings

• The study observed that the mare’s status within the group hierarchy increased post androgenization.
• This increased hierarchical position was maintained long after the cessation of the male hormone injections, with some mares continuing to rise in their rank within the group.
• The process resulted in some mares exhibiting elements of male behavior during the treatment. These behavioral traits persist even after the mares had regained their natural female hormone balance, confirmed through successful pregnancies.

Implications of the Study

• This research shows how manipulating hormones in horses can have significant and long-lasting effects on their social behavior and hierarchical positions.
• This insight could potentially open new approaches for managing social structures and behaviors in herd animals.
• However, the long-term impacts of such treatments, especially on the natural behavior and physiological health of mares, need further investigation.