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- W2055378081 abstract "It was the aim of the current study to investigate effects of seminal plasma on the chromatin structure of frozen-thawed canine (Canis lupus familiaris) spermatozoa. A total of 20 ejaculates were collected. Ejaculates were divided, and one half was centrifuged for removal of seminal plasma (c) while the other was left uncentrifuged (nc) before cryopreservation. This was performed according to the Uppsala system in a computerized freezing machine. Before freezing (bf) and after thawing (at), samples were investigated for motility (M), viability (CASA), and chromatin status (sperm chromatin structure assay; SCSA). Before freezing, the average DFI% and the SD-DFI from 20 nc ejaculates were 1.7 ± 4.0% and 18.6 ± 1.2, respectively. After thawing, all motility parameters decreased and were significantly lower in centrifuged than in noncentrifuged samples, whereas the percentage of morphologically abnormal spermatozoa (Morph) was significantly higher (nc: M bf, 84.1 ± 20.6%; M at, 51.9 ± 15%; c: M bf, 84.1 ± 20.6%; M at, 43.3 ± 22.2%; Morph nc: 28.3 ± 7.8% vs. c: 31.0 ± 9.8%). Furthermore, only in c samples did the DFI increase within 6 h after thawing (DFI c: bf, 41.8 ± 1.5%; 6 h at, 45.4 ± 6.6%; P < 0.01). The SD-DFI as well as the DFI% increased within 3 h of storage in both groups (SD-DFI nc: bf, 18.6 ± 1.2%; 3 h at, 25.8 ± 5.4%; DFI% nc: bf, 1.1 ± 4.0%; 3 h at, 6.1 ± 12.9%; P < 0.05). For both parameters, there was no significant difference between c and nc samples at any time investigated. In conclusion, centrifugation of semen samples before freezing decreased postthaw motility and increased the percentage of morphologically abnormal spermatozoa as well as the degree of sperm chromatin denaturation over time. Centrifugation of canine ejaculates before cryopreservation can therefore no longer be recommended." @default.
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- W2055378081 date "2009-12-01" @default.
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- W2055378081 title "The influence of cryopreservation and seminal plasma on the chromatin structure of dog spermatozoa" @default.
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- W2055378081 doi "https://doi.org/10.1016/j.theriogenology.2009.07.015" @default.
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