Sperm viability in the black-footed ferret (Mustela nigripes) is influenced by seminal and medium osmolality
Cryobiology(2006)
摘要
Fundamental knowledge of spermatozoa cryobiology can assist with optimizing cryopreservation protocols needed for genetic management of the endangered black-footed ferret. Objectives were to characterize semen osmolality and assess the influence of two media at various osmolalities on sperm viability. We examined the influence of Ham’s F10 +Hepes medium (H) at 270, 400, 500 or 700mOsm (adjusted with sucrose, a nonpermeating cryoprotectant) and TEST Yolk Buffer (TYB) with 0% (300mOsm) versus 4% (900mOsm) glycerol (a permeating cryoprotectant). Electroejaculates (n=16) were assessed for osmolality using a vapor pressure osmometer. For media comparison, semen (n=5) was collected in TYB 0%, split into six aliquots, and diluted in H270, H400, H500, H700, and TYB 0% or TYB 4%. Each sample was centrifuged (300g, 8min), resuspended in respective medium, and maintained at 37°C for 3h. Sperm motility and forward progression were monitored every 30min for 3h post-washing. Acrosomal integrity was monitored at 0 and 60min post-washing. Results demonstrated that black-footed ferret semen has a comparatively high osmolality (mean±SEM, 513.1±32.6mOsm; range, 366–791mOsm). Ferret spermatozoa were sensitive to hyperosmotic stress. Specifically, sperm motility was more susceptible (P<0.01) to hyperosmotic conditions than acrosomal integrity, and neither were influenced (P>0.05) by hypotonic solutions. Exposure to TYB 4% glycerol retained more (P<0.01) sperm motility than a hyperosmotic Ham’s (700mOsm). These findings will guide the eventual development of assisted breeding with cryopreserved sperm contributing to genetic management of this rare species.
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关键词
Black-footed ferret,Semen osmolality
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