86 research outputs found
Uso do diluente água de coco em pó (ACP-103®) na conservação prolongada do sêmen do varrão: avaliação in vitro e in vivo
Human testis cDNAs identified by sera from infertile patients: a molecular biological approach to immunocontraceptive development
Migration sedimentation technique as a predictive test for the fertilizing capacity of spermatozoa in an in-vitro fertilization programme
Seasonal variations in pre-and post-thaw donor sperm quality
BACKGROUND: The present study was conducted to evaluate seasonal variability in the quality of pre-and postthaw semen parameters among sperm bank donors. METHODS: The ®rst two consecutive ejaculates during the months March (spring, 92 males), June (summer, 97 males), September (autumn, 81 males) and December (winter, 97 males) were analysed. A comparison was made between sperm parameters from the same sperm donor at different seasons. Only males who donated semen samples during at least two seasons were enrolled in the study group (n = 103). Sperm specimens were cryopreserved in aliquots with ®xed range of 8±12 Q 10 6 /ml of progressive motile sperm concentration after thawing. RESULTS: Differences between months were found in sperm concentration (P = 0.030) and normal morphology (P = 0.038); highest values were found in March and December, and the lowest in September. Mean specimen volume and percent of motile sperm cells did not vary throughout the seasons. The freezability of the donors' sperm dropped dramatically from March to September, as determined by the number of straws (®xed aliquots of 0.5 ml) and total thawed progressive motile sperm that were cryopreserved for each male (P = 0.017 and P = 0.002, respectively). CONCLUSIONS: Cryopreservation of donor sperm is more effective during winter and spring than during the rest of the year
The morphology of extracted testicular sperm correlates with fertilization but not pregnancy rates
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