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A scanning electron microscopy study of frozen thawed dog sperm during In vitro gamete interaction

Authordc.contributor.authorPalomino Mackenney, Jaime 
Authordc.contributor.authorReyes Solovera, Mónica de los es_CL
Cita de ítemdc.identifier.citationReproduction in Domestic Animals, Volumen 44, Issue 2, 2009, Pages 278-283es_CL
Abstractdc.description.abstractThe aim of this work was to study the effects of cryopreservation on the binding and penetration of dog spermatozoa to the zona pellucida (ZP) by scanning electron microscopy (SEM). The sperm-rich fraction of six ejaculates from five dogs was divided into two aliquots and washed by centrifugation. One aliquot was processed as fresh control sample and the other aliquot frozen in Tris-fructose extender. Gamete interaction was assessed using in vitro matured bitch oocytes, which were co-incubated for up to 3 h. At hourly intervals after the start of co-incubation, in vitro fertilized (IVF) oocytes were processed by SEM. The results were analysed statistically using the anova test. Differences in binding and penetration of the spermatozoa to the ZP occurred; a lower proportion of oocytes with spermatozoa bound to ZP was observed using frozen sperm (p < 0.05) than with fresh sperm (61%, 57% and 53% vs 42%, 40% and 44% at 1, 2 and 3 h, respectively). The percentage of ZP penetration by fresh sperm was directly proportional to the time of co-incubation (9%, 25% and 34%; p < 0.05); in contrast, no differences were observed in the penetration rate with frozen-thawed sperm (21%, 17% and 21%). More acrosome reacted sperm were observed in frozen sperm than in fresh sperm on the surface of the ZP. The differences in the percentage of binding and penetration between fresh and frozen sperm during the co-culture could indicate that the time course of penetration is faster in frozen-thawed dog spermatozoa than in fresh sperm, but that fresh spermatozoa can penetrate more oocytes over a given period of time, which may be related to their reacted or non-reacted initial status.es_CL
Patrocinadordc.description.sponsorshipThis research was supported by the FONDECYT Grant 1060602.es_CL
Keywordsdc.subjectHomologous zona-pellucidaes_CL
Títulodc.titleA scanning electron microscopy study of frozen thawed dog sperm during In vitro gamete interactiones_CL
Document typedc.typeArtículo de revistaes_CL
Indexationuchile.indexArtículo de publicación SCOPUS
Indexationuchile.indexArtículo de Publicación ISI

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