Congenital, Inherited Bilateral Amastia in a Quarter Horse Mare.

The research is about the discovery of inherited amastia, the inability to develop mammary tissue, in a 3-year-old Quarter Horse mare, which also had a purulent vaginal discharge due to pyometra.

Research Context

• This research was conducted following an examination of a young Quarter Horse mare discovered with amastia, a characteristic appearing to be inherited.
• The horse received a thorough check-up because it also showed a sign of a suspicious vaginal discharge that turned out to be due to pyometra, a uterine infection.

Disorder of Interest: Amastia

• Amastia is a rare medical condition in which the mammary tissue fails to develop at all.
• In this study, the disorder appeared to be inherited, as the mare’s dam (mother) was also afflicted with the same condition.
• This is significant as it suggests a possible genetic mutation responsible for the disorder, a factor notable from similar cases in other species.

Secondary Condition: Pyometra

• Aside from amastia, the mare also had pyometra. This is an infection of the uterus that results in its inflammation and is often associated with purulent vaginal discharge, something that was noticed in the mare during the investigation.
• The condition can potentially have severe impacts on the health of the mare and requires a different line of treatment.

Significance and Future Directions

• The case of this Quarter Horse mare is important as it offers a rare look into the peculiar condition of congenital amastia, more specifically as an inherited trait, giving a scope to delve into further genetic studies.
• The combination of the mare’s conditions poses further challenges in equine medicine, urging for more comprehensive research and possible treatment responses.