A SYSTEMATIC STUDY OF THE MEIOTIC DIVISIONS IN NORMAL AND SUBFERTILE OR STERILE BOARS AND BULLS

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Abstract
Metaphase and anaphase figures from the meiotic divisions have been analysed and grouped in six boars and five bulls with normal fertility and in four boars and seven bulls which were relatively infertile or completely sterile. All animals had a normal semen picture except for two boars which showed spermatozoa with an acrosomal defect. The duration of metaphase and anaphase of the first and second meiotic divisions varied very little between normal animals, but varied significantly in the sterile or subfertile males. Dividing figures with an abnormal picture exist to a certain degree in normal animals and in some of the defective ones their frequency was higher. Even if chromosome changes are apparently present in some nuclei it seems more probable that the primary and main cause of the formation of defective gametes is to be found in non-chromosomal structures, as for instance the division apparatus.

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