Chromosome anomalies and infertility in the mare.

This research study examines the correlation between chromosome anomalies and infertility in mares by using three cytogenetic techniques. Out of 25 infertile mares, 12% had chromosomal anomalies, unlike the control group.

Research Objectives and Methods

• The study’s main objective was to investigate the relationship between chromosomal anomalies and infertility in mares (female horses). The study used three different cytogenetic techniques to achieve this: Conventional Giemsa staining, C-banding, and G-banding.
• The sample population comprised nine reproductively healthy mares, 25 infertile mares, and a set of heterosexual twins.

Research Findings

• The use of G-banding, a technique for staining chromosomes, was found to be essential for identifying even significant abnormalities.
• The study uncovered that 12% of infertile mares had chromosomal anomalies. The abnormalities discovered included 63,XO, 63,XO/64,XX mixoploid, and 64,XY sex-reversed male chromosomes.
• Interestingly, none of the control group mares, which consisted of the nine reproductively normal mares and the pair of heterosexual twins, had any chromosomal abnormalities.

Conclusions and Implications of the Study

• The findings support the argument that cytogenetic examination, particularly G-banding, can be a valuable diagnostic tool for identifying chromosomal anomalies that may be causing infertility in mares.
• Despite the research insights, it is argued that routine screening of the entire mare population might not be economically viable given the cost associated with these cytogenetic tests.