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Contents: Three mares that had heen diagnozed clinically as sterile were cytogenetically investigated. For each o f the mures 63 or more metaphases were analyzed (63 metaphases in one case, 72 metaphases in the 2nd case and 90 rnetaphases in the 3rd case). Only the sex chromosomal monosomy (63, X) were detected in each of the metaphases. Using the G‐banding technique unpairing X‐chromosomes, was accurately distinguished from autosomes nos. 1 and 2. The incidence of drumstick was 0.5 76 and 0.2 % respectively in two cases. The most obvious clinical abnormality was gonadal dysgenesis, which was observed in all mares. N o clear‐cut oestrus symptoms were detectable despite repeated treatment with various hormones.

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A translocation with centric fusion between the Nos. 13 and 17 acrocentric chromosomes was described in a malformed female piglet and three phenotypically normal littermates by the G-banding staining technique. Since the translocation was heterozygous, the chromosome number was 37. The differences between the translocation of the present cases and those previously reported in the domestic swine species, as well as in some wild pigs, are mentioned.

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