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Comparative histomorphological study of endometrium in mares.

M Herrera1,2, J M Herrera2, S Cantatore1,3

  • 1Facultad de Ciencias Veterinarias, Laboratorio de Clínica y Reproducción Equina, CIVETAN, UNICEN, Tandil, Argentina.

Anatomia, Histologia, Embryologia
|January 10, 2018
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Summary

Mare susceptibility to endometritis is linked to specific endometrial characteristics. Susceptible mares exhibit greater epithelial height and glandular development during oestrus, impacting fertility.

Keywords:
endometritisendometriumhistomorphologymare

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Area of Science:

  • Reproductive Biology
  • Veterinary Medicine
  • Equine Science

Background:

  • Persistent endometritis causes subfertility in mares (Equus ferus caballus).
  • Mares are classified as susceptible or resistant to endometritis based on intrauterine fluid clearance.
  • Endometrial biopsy and histomorphometry are key diagnostic tools for assessing fertility-compromising lesions.

Purpose of the Study:

  • To compare endometrial histomorphometry in mares susceptible (SM) versus resistant (RM) to endometritis during oestrus.
  • To investigate potential correlations between endometrial structural characteristics and endometritis susceptibility.

Main Methods:

  • Endometrial biopsies were collected from 24 mares during oestrus.
  • Histomorphometric analysis involved routine Haematoxylin-Eosin staining.
  • Evaluated variables included epithelial height, glandular diameters, and gland density.

Main Results:

  • Susceptible mares (SM) showed greater lining epithelial height (15.9 μm) than resistant mares (RM) (13.3 μm).
  • Glandular epithelia height was greater in SM (15.0 μm) vs. RM (13.0 μm).
  • SM had larger glandular perpendicular diameters (51.3 μm vs. 44.8 μm) and higher gland density (24.8 glands/field vs. 20.5 glands/field).

Conclusions:

  • Histomorphometric differences in endometrial structure are associated with endometritis susceptibility in mares.
  • Increased epithelial height, glandular density, and gland development during oestrus correlate with higher endometritis susceptibility.
  • These findings offer insights into the physiological basis of equine endometritis and subfertility.