Summary. In an analysis of the chromosomes in 332 metaphase II

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.

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