Summary. Two sheep of different breed displayed gross testicular hypoplasia, azoospermia, and apparent aspermatogenesis. The modal chromosome number was 55 in all tissues studied, the extra chromosome being identified as an X from sex chromatin studies on one animal. The abnormalities resemble those of chromatin-positive Klinefelter's syndrome in man, with a comparable incidence and a possibly identical cause in the two species.
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Bruère et al. (1969) studied this question.
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