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- W2028173690 abstract "The Somalia wild ass (Equus africanus somaliensis) is a critically endangered taxon (IUCN 2004 red list) which could benefit from biological resource banking. In this work, we studied the effect of different extenders applied to the cryopreservation of epididymal sperm obtained from one male of this subspecies. This animal (13 years old; housed in Cabarceno Park, Cantabria, Spain) was castrated because of very aggressive behavior with other mature males. Genitalia were dissected and weighed (testicles: right, 166 g, and left, 179 g; cauda epididymis: right, 9.3 g, and left, 11.8 g). Sperm were flushed from the cauda epididymis, yielding 15 mL of sample. Sperm concentration was 15 × 109 spermatozoa/mL, totaling 225 × 109 (allowing 4500 doses at 50 × 106 sperm/dose). Sperm motility (TM = % total motile; PM = % progressive; VAP = average path velocity) was assessed by CASA (Microptic, Barcelona, Spain). Viability (VIAB = % viable sperm) and acrosomal status (ACR = % viable spermatozoa with intact acrosomes) were assessed using propidium iodide (37 μmol/L) and PNA-FITC (1 ng/L) and flow cytometry. Chemicals were purchased from Sigma (Madrid, Spain). Part of the sample was divided into six aliquots and diluted 1:1 with different extenders: UL4: Tes-Tris-Fructose (TTF), 10% egg yolk (EG), and 4% glycerol (G); UL8: TTF, 20% EG, and 8% G; AND4: Andromed® (Minitüb, Tiefenbach, Germany) and 4% G; AND7: Andromed® and 7% G; GENT: Gent 1045; and INRA: INRA96 and 4% G. Andromed, Gent, and INRA are commercial extenders. Samples were cooled to 5°C (−0.2°C/min) and then diluted to 200 × 106 sperm/mL. Samples were packed (0.5-mL straws) and frozen using a biofreezer (from 5°C to −15°C at −15°C/min, and from −15°C to −100°C at −25°C/min). Samples were thawed at 65°C for 6 s, and assessed as for pre-freezing (Table 1). Post-thawing motility recovery using AND7 was excellent. The highest viability recovery was achieved by UL4, although that in AND7 was similar. The poor results of equine commercial extender Gent 1045 in this species are remarkable. Our results highlight the importance of species differences in the field of sperm cryopreservation. It is necessary to carry out continuous research for optimizing cryopreservation protocols in order to create germplasm banks for wild species. Table 1. Quality assessment results" @default.
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- W2028173690 date "2006-01-01" @default.
- W2028173690 modified "2023-10-15" @default.
- W2028173690 title "215 EPIDIDYMAL SPERM CRYOPRESERVATION OF ONE SOMALIA WILD ASS (EQUUS AFRICANUS SOMALIENSIS) USING SIX DIFFERENT EXTENDERS" @default.
- W2028173690 doi "https://doi.org/10.1071/rdv18n2ab215" @default.
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