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Infertile mares with chromosome abnormalities.

I A Stewart-Scott1

  • 1Biotechnology Division, DSIR, Private Bag, Palmerston North, New Zealand.

New Zealand Veterinary Journal
|June 1, 1988
PubMed
Summary

Chromosomal abnormalities are linked to infertility in mares. Karyotyping revealed various sex chromosome anomalies in five mares with poor reproductive outcomes, suggesting a significant cause of equine sterility.

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Area of Science:

  • Veterinary Science
  • Genetics
  • Reproductive Biology

Background:

  • Poor reproductive performance in mares can stem from various factors.
  • Chromosomal abnormalities are increasingly recognized as a potential cause of infertility in domestic animals.

Purpose of the Study:

  • To investigate the presence and types of chromosomal abnormalities in mares exhibiting poor reproductive performance.
  • To determine if sex chromosome anomalies correlate with reproductive failure in mares.

Main Methods:

  • Karyotyping of peripheral blood samples from five infertile mares.
  • Analysis of oestrous cycle regularity and gonadal size.

Main Results:

  • Five mares with poor reproductive performance were identified with chromosomal abnormalities.
  • Abnormal karyotypes included 65, XXX (one mare), 64, XY sex-reversal (two mares), and sex chromosome mosaics (two mares).
  • Affected mares exhibited small gonads and irregular or absent oestrous cycles.

Conclusions:

  • Sex chromosome abnormalities are a significant factor contributing to sterility in mares.
  • Karyotyping is a valuable diagnostic tool for identifying the causes of reproductive failure in mares.
  • This study supports previous findings linking chromosomal anomalies to equine infertility.

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