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- W2000463359 abstract "Two experiments were conducted to determine the effects of egg yolk (EY), glycerol, and cooling rate on the cryosurvival of red deer epididymal spermatozoa. The aim of Experiment 1 was to examine the effects of two EY types (clarified EY, CE, prepared by centrifugation, and whole EY, WE), and four EY concentrations (0, 5, 10 and 20%) on cryosurvival of red deer epididymal spermatozoa. Sperm samples were diluted to a final sperm concentration of ∼200 × 106 spermatozoa/ml with a Tris-citrate-fructose-EY extender (TCF) prior to freezing. Sperm cryosurvival was judged in vitro by microscopic assessments of individual sperm motility, viability and of plasma membrane (by means of the HOS test) and acrosome (NAR) integrities. Cryopreservation of red deer epididymal spermatozoa frozen in a clarified EY extender, and with a 20% EY resulted in more vigorous post-thaw and post-incubation motilities (P < 0.0001). Moreover, our results showed that regardless of the egg yolk concentration tested, the best sperm quality was obtained with the use of CE. Therefore, the objective of Experiment 2 was to explore the post-thaw effects of four clarified egg yolk concentrations (0, 5, 10 and 20%), two final glycerol concentrations (3 and 6%), and two cooling rates from 22 to 5 °C (slow: 0.23 °C/min; rapid: 4.2 °C/min) on red deer epididymal spermatozoa. At thawing, the effects of CE and glycerol concentrations, and cooling rate, all independently affected post-thaw sperm quality, while there were no effects of interactions on post-thawing sperm quality. Therefore, we studied each variable separately. Differences (P < 0.05) for most of the semen parameters evaluated were found between the two final glycerol concentrations tested, with the high values after thawing found with the use of 6% glycerol (58.8 ± 1.4 versus 46.2 ± 1.4, for sperm motility). Moreover, the cooling rate did not have an effect on the semen characteristics, except for NAR (P < 0.05), with the high values after thawing found with the use of the rapid protocol (64.5 ± 1.4 versus 59.9 ± 1.4). In conclusion, the use of 20% CE and 6% glycerol in combination with a rapid cooling rate, significantly improved red deer epididymal spermatozoa freezability." @default.
- W2000463359 created "2016-06-24" @default.
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- W2000463359 date "2006-11-01" @default.
- W2000463359 modified "2023-10-15" @default.
- W2000463359 title "Cryopreservation of Iberian red deer (Cervus elaphus hispanicus) epididymal spermatozoa: Effects of egg yolk, glycerol and cooling rate" @default.
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- W2000463359 doi "https://doi.org/10.1016/j.theriogenology.2006.05.012" @default.
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