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Single-layer centrifugation through Pure Sperm® 80 selects improved quality spermatozoa from frozen-thawed dog semen

Dorado, J.; Alcaraz, L.; Gálvez, M.J.; Acha, D.; Ortiz, I.; Urbano, M.; Hidalgo, M.

Animal Reproduction Science 140(3-4): 232-240

2013

ISSN/ISBN: 0378-4320
PMID: 23896392
DOI: 10.1016/j.anireprosci.2013.06.012
Accession: 055797882
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The aim of this study was to investigate whether Single-Layer Centrifugation (SLC) with PureSperm 80 could select good quality spermatozoa, including those with specific motility patterns, from doses of frozen dog semen. Semen from 5 dogs was collected and cryopreserved following a standard protocol. After thawing, semen samples were divided in two aliquots: one of them was used as control and the other one processed by SLC. Assessment of sperm motility (assessed by computer-assisted semen analysis), morphology (Diff-Quick staining) and viability (triple fluorescent stain of Propidium iodine/isothiocyanate-labeled peanut (Arachis hypogaea) agglutinin/Rhodamine 123), were performed on aliquots of fresh semen, frozen-thawed control and frozen-thawed SLC treated samples. A multivariate clustering procedure separated 26051 motile spermatozoa into three subpopulations (sP): sP1 consisting of highly active but non-progressive spermatozoa (40.3%), sP2 consisting of spermatozoa with high velocity and progressive motility (30.0%), and sP3 consisting of poorly active and non-progressive spermatozoa (29.7%). SLC with PureSperm 80 yielded sperm suspensions with improved motility, morphology, viability and acrosome integrity (P<0.001). The frozen-thawed SLC treated samples were enriched in sP2, reaching a proportion of 44.1% of the present spermatozoa. From these results, we concluded that SLC with PureSperm 80 may be an alternative and successful method for improving the quality of frozen-thawed dog spermatozoa. Moreover, sP2 (high-speed and progressive spermatozoa) was more frequently observed after SLC. Finally, this study also demonstrated that the general motile sperm structure present in dogs remained constant despite the effect caused by either cryopreservation or separation by SLC through PureSperm 80.

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