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Free Content Effect of the Ph Pre-Adjustment in the Freezing Extender On Post-Thaw Boar Sperm Quality

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BACKGROUND: During freezing the selective precipitation of substances in the medium may provoke a pH shift and lead to sperm damage.

OBJECTIVE: To study the effect of the pH pre-adjustment in the freezing extender on post-thaw boar sperm quality.

METHODS: A total of 15 ejaculates from different boars were obtained and divided into six aliquots prior to a standard straw cryopreservation in freezing extender (lactose-egg yolk-glycerol-Orvus ES Paste) with different pH. After thawing, sperm quality (plasma membrane integrity, motility and acrosome status) were assessed at 30 and 90 minutes of post-thaw incubation at 37°C.

RESULTS: When the boar sperm were frozen in a freezing media with pH basic, and particularly at pH 8, it had higher post-thaw sperm quality.

CONCLUSION: The pre-adjustment at pH 8 of the freezing extender (lactose-egg yolk-glycerol-Orvus ES Paste) is able to improve the post-thaw boar sperm quality.

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Document Type: Research Article

Publication date: March 1, 2015

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  • CryoLetters is a bimonthly international journal for low temperature sciences, including cryobiology, cryopreservation or vitrification of cells and tissues, chemical and physical aspects of freezing and drying, and studies involving ecology of cold environments, and cold adaptation

    The journal publishes original research reports, authoritative reviews, technical developments and commissioned book reviews of studies of the effects produced by low temperatures on a wide variety of scientific and technical processes, or those involving low temperature techniques in the investigation of physical, chemical, biological and ecological problems.

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