title: An examination of chromosomes in the stallion (Equus caballus) during meiosis.
abstract: Meiotic preparations were made from testicular material obtained after surgical castration of eight stallions (Equus caballus) with normal spermatogenesis. The material was examined after conventional Giemsa staining and C-banding. C-banding demonstrated that the Y chromosome at diakinesis associated with the short arm of the X chromosome. In 315 cells at diplotene or diakinesis, 56 (17.7%) had univalents and 51 (16.1%) of these involved the sex chromosomes. The overall mean chiasma number was 54.4 +/- 1.8 SD, and the mean calculated nondisjunction (ND) frequency was 3.4%. These results are discussed in relation to other domestic species.
mesh_terms: D000818:Animals; D002871:Chromosome Banding; D002875:Chromosomes / Q000648:ultrastructure*; D006736:Horses / Q000235:genetics*; D007621:Karyotyping; D008297:Male; D008540:Meiosis; D013091:Spermatogenesis