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- W2003187422 abstract "The objective was to determine the in vitro characteristics of frozen-thawed dairy bull sperm after sex-sorting and refreezing and thawing (0, 2, and 4 h post-thaw; 37 °C) or post-sort incubation at 15 or 37 °C for 30 and 24 h, respectively. These sperm were compared with nonsorted frozen-thawed sperm (control) and with nonsorted sperm undergoing two cryopreservation procedures (FF; 0, 2, and 4 h). Frozen-thawed sex-sorted (FS) sperm maintained at 15 or 37 °C had higher (P < 0.001) progressive motility (PM), velocity, mitochondrial function, viability, and acrosome integrity than that of control sperm but similar total motility at 0 and 2 h of incubation. Frozen-thawed sex-sorted sperm incubated at 15 °C maintained high levels of motility (66.5 ± 1.6%) and viability/acrosome integrity (64.9 ± 1.2%) at 24 h incubation and, after rewarming and further 6 h incubation at 37 °C, acceptable levels of motility (35.8 ± 1.6%) and viability/acrosome integrity (51.2 ± 1.2%) were maintained. Frozen-thawed sex-sorted sperm maintained at 37 °C had lower levels of motility, integrity, mitochondrial respiration, and velocity from 4 h of incubation onward than that of those incubated at 15 °C. However, when frozen-thawed sex-sorted sperm were refrozen (FSF), motility and velocity were depressed at all hours compared with levels exhibited by control sperm, but membrane viability/acrosome integrity and mitochondrial respiration were similar at 0 and 2 h post-thaw. Acrosome integrity of sperm in all groups undergoing sorting was exceptionally high at 0 h (≥90%), even after re-cryopreservation and 4 h of incubation (77.5 ± 1.3%). Double frozen-thawed nonsorted sperm (FF) had similar motility to FSF sperm at 0 and 2 h post-thaw but at all time points had the lowest (P < 0.001) levels of acrosome intact/viable sperm and mitochondrial respiration and the lowest velocity at 0 h. In conclusion, whereas sex-sorting improved the functionality of frozen-thawed sperm, refreezing depressed motility, viability, and velocity but not acrosome integrity after extended incubation compared with that of control sperm. Furthermore, frozen-thawed, sex-sorted sperm may be stored for transport at 15 °C for up 24 h without detrimental effects on in vitro sperm characteristics." @default.
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- W2003187422 date "2009-10-01" @default.
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- W2003187422 title "In vitro characteristics of frozen-thawed, sex-sorted bull sperm after refreezing or incubation at 15 or 37 °C" @default.
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- W2003187422 doi "https://doi.org/10.1016/j.theriogenology.2009.06.023" @default.
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