[Pigmentation disorders in the nasal vestibule of horses with nasal discharge].

Overview

• This study investigated the depigmentation of the nasal vestibule in horses, particularly focusing on the ventral part, analyzing its relationship to nasal discharge, age, and horse type (warmblood vs. pony).
• The research quantified the depigmented area using software and examined how it correlates with nasal discharge and other parameters to better understand airway disorders in horses.

Introduction and Background

• The nasal vestibule in many horses is normally pigmented, especially in the ventral area.
• In some horses, there is a notable loss of pigmentation (depigmentation) in this area, creating clearly visible depigmented patches.
• Nasal discharge, a common symptom of airway disorders, passes over this ventral nasal vestibule area.
• The study aims to practically quantify the extent of this depigmentation and analyze how it correlates with nasal discharge and other factors such as age and horse breed.

Methods

• The study sample consisted of 74 horses: 59 warmblood horses and 15 ponies, all having a pigmented nasal vestibule.
• Whenever depigmentation in the ventral nasal vestibule was present, this area was photographed.
• The photographs were analyzed and the depigmented area quantified with specialized software to provide objective measurements (in cm²).
• Additional data recorded included:
  • General parameters about the horses (age, breed type).
  • Presence and characteristics of nasal discharge (amount, consistency).
  • Basic microbiological assessment of the nasal discharge.

Results

• Depigmentation area was generally larger in warmblood horses compared to ponies:
  • Median combined depigmented area for both nostrils in warmbloods was about 1.6 cm².
  • Median for ponies was about 0.5 cm².
• Warmblood horses showed:
  • A positive correlation between depigmentation area and age — older horses had more extensive depigmentation.
  • A larger depigmented area in horses displaying nasal discharge compared to those without (2.5 cm² vs. 1.4 cm² respectively).
  • Positive correlation of depigmentation area with both age and presence of nasal discharge.
• Ponies exhibited:
  • A significant increase in depigmentation associated with presence of nasal discharge (1.3 cm² with discharge vs. 0.1 cm² without).
  • No significant correlation between depigmentation and age.
• No other significant correlations or dependencies (such as discharge consistency or microbiology) were identified.

Interpretation and Significance

• Increasing age and the presence of nasal discharge contribute to the extent of depigmentation in the ventral nasal vestibule of horses.
• The larger depigmentation area in horses with nasal discharge suggests a possible link between structural or inflammatory changes in the nasal tissue and airway disorders.
• Age-related increases in depigmentation for warmbloods may reflect cumulative exposure to environmental or infectious agents affecting the nasal mucosa over time.
• For ponies, the relationship centers more clearly on current nasal discharge rather than age, indicating a possibly different disease or tissue response pattern.
• Estimating the degree of nasal vestibule depigmentation can serve as a practical and useful clinical indicator—providing additional information about the airway health and potential chronicity of nasal disorders in horses.

Conclusions

• The study established a practical method for quantifying nasal vestibule depigmentation using photographic software analysis.
• Depigmentation in the ventral nasal vestibule is influenced by age and nasal discharge, differing somewhat between horse breeds.
• Monitoring these depigmented areas can contribute to improved clinical assessment and understanding of airway disease processes involving nasal discharge in horses.

Additional Notes

• The article includes both English and German summaries, suggesting that the research was conducted or published in a German-speaking context.
• The study focused on a visible external sign (depigmentation) rather than invasive biopsy or histological analysis, emphasizing its practical applicability in clinical settings.