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- W2080176146 abstract "A programmable cell freezer provides ideal cryobiological conditions for controlled-rate cooling and freezing of ram spermatozoa. The purpose of this study was to investigate the effects of controlled (Group 1) and uncontrolled (Group 2) cooling conditions prior to programmable freezing of ram semen on post-thaw sperm motion characteristics and acrosomal integrity of ram spermatozoa. Semen samples of good initial motility obtained from adult Malpura rams were pooled, diluted to 1 × 109 spermatozoa per milliliter with Egg yolk-TEST-glycerol extender, and packaged in 0.25 mL straws. Straws representing Group 1 were cooled in a programmable cell freezer from 25°C to 5°C at the rate of −0.15°C per minute followed by a holding time of 2 h for equilibration, while straws of Group 2 were allowed to cool slowly up to 5°C and equilibrate for 2 h in the cold cabinet. After equilibration, straws of Group 2 were also loaded in the cell freezer for freezing straws of both the treatment groups simultaneously from 5°C to −125°C at the rate of −25°C per minute. Thawing of straws was done at 50°C for 10 s and the quality of frozen-thawed spermatozoa was objectively assessed by using sperm motility analyzer. Thawed samples were also evaluated for acrosomal integrity after staining the dried semen smears with Giemsa stain. The average post-thaw motility of straws was significantly higher (P < 0.05) in samples frozen after controlled cooling, compared with samples frozen after uncontrolled rate of cooling. The percent of spermatozoa with normal acrosome was also significantly (P < 0.05) higher in Group 1, compared to Group 2. The results indicate that controlled-rate cooling has a significant effect on post-thaw motility and acrosomal integrity of frozen-thawed ram spermatozoa, compared to uncontrolled-rate cooling prior to programmable freezing." @default.
- W2080176146 created "2016-06-24" @default.
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- W2080176146 date "2008-12-01" @default.
- W2080176146 modified "2023-09-24" @default.
- W2080176146 title "Effect of Controlled and Uncontrolled Rate of Cooling, Prior to Controlled Rate of Freezing, on Motion Characteristics and Acrosomal Integrity of Cryopreserved Ram Spermatozoa" @default.
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- W2080176146 doi "https://doi.org/10.1089/bio.2008.0013" @default.
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