Colloid single-layer centrifugation improves post-thaw donkey (Equus asinus) sperm quality and is related to ejaculate freezability
I. Ortiz A , J. Dorado A , D. Acha A , M. J. Gálvez A , M. Urbano A and M. Hidalgo A B
+ Author Affiliations
- Author Affiliations
A Animal Reproduction Group, Department of Animal Medicine and Surgery, University of Cordoba, 14071 Córdoba, Spain.
B Corresponding author. Email: mhidalgo@uco.es
Reproduction, Fertility and Development 27(2) 332-340 https://doi.org/10.1071/RD13246
Submitted: 3 August 2013 Accepted: 17 October 2013 Published: 4 December 2013
Abstract
The aim of this study was to determine whether colloid single-layer centrifugation (SLC) improves post-thaw donkey sperm quality and if this potential enhancement is related to ejaculate freezability. Semen from Andalusian donkeys was frozen following a standard protocol. SLC was performed on frozen–thawed semen and post-thaw sperm parameters were compared with uncentrifuged samples. Sperm quality was estimated by integrating in a single value sperm motility (assessed by computer-assisted sperm analysis), morphology and viability (evaluated under brightfield or fluorescence microscopy). Sperm freezability was calculated as the relationship between sperm quality obtained before freezing and after thawing. Ejaculates were classified into low, medium and high freezability groups using the 25th and 75th percentiles as thresholds. All sperm parameters were significantly (P < 0.01) higher in SLC-selected samples in comparison to uncentrifuged frozen–thawed semen and several kinematic parameters were even higher than those obtained in fresh semen. The increment of sperm parameters after SLC selection was correlated with ejaculate freezability, obtaining the highest values after SLC in semen samples with low freezability. We concluded that, based on the sperm-quality parameters evaluated, SLC can be a suitable procedure to improve post-thaw sperm quality of cryopreserved donkey semen, in particular for those ejaculates with low freezability.
Additional keywords: cryopreservation, sperm freezability.
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