Classification and quantification of abnormal sperm along the epididymal tract. Comparison between adult and aged hamsters

― The types and averages of abnormal sperm were studied in the epididymis of adult and aged golden hamsters. Abnormal spermatozoa represent 14.6-19.6% of the total of spermatozoa in adults, 31.7-42. 1 % in middled-aged hamsters, and 39.3-50% in advanced-aged hamsters. Twelve abnormal shapes were found, with the lack of an acrosome, the lack of a head, and the coiling of the tail, being the most frequent in the three age groups. An important increase in the number of coiled spermatozoa was found in the corpus and proximal cauda of the epididymis, but a decrease was observed in the distal cauda. Our data suggest that the epididymis produces secondary defects in spermatozoa running from the proximal caput to the middle zone of the duct, but that many of these spermatozoa are eliminated in the distal cauda. Such a result is mainly found in aged animals, in which a higher percentage of abnormal sperm from secondary origin is found with respect to adults. epididymis / spermatozoa / ageing Rsum ― Classification et quantification des spermatozodes anormaux le long du conduit pididymaire. Comparaison entre hamsters adultes et vieux. Les types et pourcentages de sperma- tozodes anormaux dans l'pididyme des hamsters adultes et vieux ont t tudis. Les spermatozodes anormaux reprsentent 14,6-19,6 % du total des spermatozodes chez les adultes, 31,7-42,1 % chez les hamsters d'ge mr et 39,3-50 % chez les hamsters en phase avance de vieillissement. Douze formes anormales ont t identifies. L'absence d'acrosome, l'absence de tte et l'enroulement de la queue sont les plus frquents dans les trois groupes d'ge. On trouve une augmentation importante de spermatozodes enrouls dans le corpus et la cauda proximale de l'pididyme, et une rduction dans