Effect of season on individual stallion semen characteristics.

Horses are long-day seasonal breeding animals, however, with modern stallion reproductive management it is important for collection of semen during periods that are not part of the traditional breeding season. This study was conducted to examine variation in the seminal characteristics of individual stallions in Avila, Spain during 1 year with a particular emphasis on sperm DNA fragmentation. Semen was collected twice per season from a total of 20 stallions. There was a marked seasonal effect on all seminal characteristics, with the greatest on progressive motility, % membrane integrity and least for SDF in the spring months; there was also an interaction effect with respect to individual stallion, indicating that some stallions did not fit this generalised pattern for semen quality. Sperm DNA fragmentation was assessed both immediately after semen collection (T0) and following incubation of extended semen for 24 h (T24) to broadly mimic changes in SDF that might occur in the female reproductive tract. While SDF evaluated at T0 was also generally less in spring, the proportion of stallions with the least SDF values in spring increased from 45% to 60% when assessed at T24, therefore, being consistent with the importance of dynamic SDF assessment in detecting DNA damage that was not detected at T0 or cryptic DNA damage. The results from this study indicate there is individual seasonal variation among stallions in all aspects of seminal characteristics; such variation needs to be considered when prioritising stallions that are to be used for breeding.

1p36 is a chromosomal site of genomic instability in cervical intraepithelial neoplasia.

We investigated the association between progressive stages of cervical neoplasia and DNA damage in 1p36 DNA sequences of chromosome 1 in cervical epithelium using DNA breakage detection/fluorescence in situ hybridization (DBD-FISH). We used a hospital based unmatched case control study of 29 women that were grouped according to disease stage and selected according to histological diagnosis: 10 with low grade squamous intraepithelial lesions (LG-SILs), 10 with high grade SILs (HG-SILs) and nine with no cervical lesions; the 1pter sequence was used as internal control. We found a significant increase in the number of patients with HG-SIL compared to patients with LG-SILs or with no cervical lesions. 1p36 Genomic instability was validated by DBD-FISH using neutral comets. Genetic instability at specific gene loci, such as 1p36, might be characteristic of cervical cancer progression. DBD-FISH appears to be a useful approach for detecting and comparing damage to specific chromosomal regions related to the progression of cervical cancer.

The erector spinae plane block (ESPB) in the management of chronic thoracic pain. Correlation of pain/analgesia areas and long term effect of the treatment in three cases / El bloqueo del plano del erector espinal en el manejo del dolor torácico crónico. Correlación de las áreas de dolor/analgesia y efecto a largo plazo del tratamiento en 3 casos

The erector spinae plane block (ESPB) is a technique that is used both as perioperative analgesia and in the management of chronic pain. This has been described recently and is being a resource increasingly used for its easy implementation and low rate of complications. However, the correlation between pain and analgesia, as well as its long-term effect on chronic pain, should be studied. We present a series of 3 cases in which the effectiveness of the ESPB in patients with chronic chest pain was evaluated. The block was performed in all cases by depositing 20ml of 0.2% Ropivacaine in the fascial plane of the erector spinae muscle. The pain was measured using a numerical scale prior to the block, at 30minutes and a month. The areas were marked on the skin with different colours for comparison

El bloqueo del plano del erector espinal (ESPB, por sus siglas en inglés) es una técnica que se emplea tanto como analgesia perioperatoria como en el manejo del dolor crónico. Esta ha sido descrita recientemente y está siendo un recurso cada vez más utilizado por su fácil realización y su baja tasa de complicaciones. No obstante, la correlación entre dolor y analgesia, así como su efecto a largo plazo en el dolor crónico deben ser estudiados. Presentamos una serie de 3 casos en los que se evaluó la eficacia del ESPB en pacientes con dolor torácico crónico. El bloqueo fue realizado en todos los casos depositando 20ml de ropivacaína al 0,2% en el plano fascial del músculo rector espinal. El dolor fue medido mediante escala numérica previo al bloqueo, a los 30min y al mes. Las áreas fueron marcadas en la piel con colores diferentes para su comparación

The erector spinae plane block (ESPB) in the management of chronic thoracic pain. Correlation of pain/analgesia areas and long term effect of the treatment in three cases.

The erector spinae plane block (ESPB) is a technique that is used both as perioperative analgesia and in the management of chronic pain. This has been described recently and is being a resource increasingly used for its easy implementation and low rate of complications. However, the correlation between pain and analgesia, as well as its long-term effect on chronic pain, should be studied. We present a series of 3 cases in which the effectiveness of the ESPB in patients with chronic chest pain was evaluated. The block was performed in all cases by depositing 20ml of 0.2% Ropivacaine in the fascial plane of the erector spinae muscle. The pain was measured using a numerical scale prior to the block, at 30minutes and a month. The areas were marked on the skin with different colours for comparison.

Protamine composition of koala and wombat spermatozoa provides new insights into DNA stability following cryopreservation.

To investigate differences in the post-thaw DNA stability of koala and wombat spermatozoa, protamine amino acid sequences were compared and it was found that there were three more arginine residues for the wombat. Koala and wombat spermatozoa, cryopreserved using identical protocols, were examined for changes in sperm DNA fragmentation (SDF) dynamics over 24h of post-thaw incubation. Following validation of a wombat sperm chromatin dispersion test, wombat DNA showed a rate of SDF that was 6-fold higher than for koala spermatozoa (P=0.038). Finally, we examined whether expected differences in chromatin compactness, associated with protamine sequence, had an effect on restriction site accessibility of sperm DNA. Thawed spermatozoa were exposed to Alu I and EcoR1 endonuclease restriction enzymes and the SDF dynamics were observed. Koala spermatozoa exposed to Alu I showed a greater rate of SDF (P=0.01), whereas wombat spermatozoa exposed to EcoR1 showed a greater rate of SDF (P=0.032). We conclude that restriction sites in these species are differentially present or exposed and potentially account for differences in SDF dynamics. Although differences in the arginine composition of protamine may explain relative differences in SDF following cryopreservation, they do not support the hypothesis that increased arginine composition increases DNA stability; rather, increased arginine composition in the wombat may reduce post-thaw chromatin swelling.

Effect of sperm dosage transportation in stallions: Effect on sperm DNA fragmentation.

Artificial insemination programs for horses usually involve ex vivo handling and transporting of sperm. The present experiment was designed to: (i) assess the effect of transportation on sperm DNA integrity at different time post semen collection, and (ii) evaluate if sperm DNA quality deteriorates rapidly beyond 24 h of cooled storage. After collection, the ejaculates were extended using INRA 96 and semen was prepared for prompt analysis (A0) or 24 h/48 h cooled-shipping (B24 and C48 respectively). Each sample was assessed for sperm DNA fragmentation index (SDFI) at time 0 and after incubation for 2, 6 and 24 h at 37 °C. There was very little difference in SDFI between freshly extended (A0) and 24 h/48 h cooled-transported semen samples (B24/C48) at time 0. After 2 h of incubation at 37 °C, there was an increase in SDFI ranging from 2.7% to 7.5% per hour in freshly extended semen samples (A0: 5.1 ± 1.5), while cooled-transported semen samples had a much greater increase in SDFI, ranging from 5.0% to 20.5% (B24: 14.7 ± 5.6) and from 8.2% to 26.8% (C48: 18.3 ± 7.2) respectively. There were not marked differences in the sperm DNA integrity between 24 and 48 h for transported samples, thus there is the possibility of desirable fertility with use of stallion sperm after 48 h of cooled storage.

Utilidad de la ecografía diafragmática en el diagnóstico precoz de parálisis frénica tras cirugía de hombro para prevenir complicaciones respiratorias postoperatorias / Usefulness of diaphragmatic ultrasound in the early diagnosis of phrenic nerve palsy after shoulder surgery in the prevention of post-operative respiratory complications

El bloqueo del nervio frénico es una complicación que puede producirse tras la anestesia del plexo braquial por encima de la clavícula. La principal consecuencia de este bloqueo es la parálisis diafragmática ipsolateral, que en ocasiones puede suponer aparición de complicaciones respiratorias postoperatorias. Presentamos un caso clínico de una mujer que tras ser intervenida de una prótesis total de hombro presentó disnea en la unidad de recuperación posquirúrgica. Se realizó una ecografía diafragmática que permitió un diagnóstico rápido de parálisis completa del hemidiafragma ipsolateral. Ante la sospecha de bloqueo del nervio frénico, la ecografía ha demostrado ser una herramienta diagnóstica rápida con alta sensibilidad y especificidad. Su empleo puede anticipar el posible desarrollo de complicaciones inmediatas, y orientarnos para escoger la estrategia terapéutica adecuada para cada caso de una manera precoz. En nuestro caso nos permitió tratar de forma precoz mediante oxigenoterapia, retirada de catéter interescalénico y vigilancia intensiva

Phrenic nerve block is a complication that can occur after brachial plexus anaesthesia above the clavicle. The main consequence of this blockage is ipsolateral diaphragmatic paralysis, which can sometimes lead to the appearance of post-operative respiratory complications. A case is presented on a woman, who after having undergone a total shoulder prosthesis, presented with dyspnoea in the post-operative recovery unit. A diaphragmatic ultrasound was performed that enabled a rapid diagnosis to be made of a complete paralysis of the ipsolateral hemi-diaphragm. Given the suspicion of phrenic nerve block, ultrasound has proven to be a rapid diagnostic tool with high sensitivity and specificity. Its use can anticipate the possible development of immediate complications, and act as a guide in choosing the appropriate therapeutic strategy for each case in an early manner. In this case it enabled us to treat early with oxygen therapy, interscalene catheter removal, and intensive surveillance

Usefulness of diaphragmatic ultrasound in the early diagnosis of phrenic nerve palsy after shoulder surgery in the prevention of post-operative respiratory complications. / Utilidad de la ecografía diafragmática en el diagnóstico precoz de parálisis frénica tras cirugía de hombro para prevenir complicaciones respiratorias postoperatorias.

Phrenic nerve block is a complication that can occur after brachial plexus anaesthesia above the clavicle. The main consequence of this blockage is ipsolateral diaphragmatic paralysis, which can sometimes lead to the appearance of post-operative respiratory complications. A case is presented on a woman, who after having undergone a total shoulder prosthesis, presented with dyspnoea in the post-operative recovery unit. A diaphragmatic ultrasound was performed that enabled a rapid diagnosis to be made of a complete paralysis of the ipsolateral hemi-diaphragm. Given the suspicion of phrenic nerve block, ultrasound has proven to be a rapid diagnostic tool with high sensitivity and specificity. Its use can anticipate the possible development of immediate complications, and act as a guide in choosing the appropriate therapeutic strategy for each case in an early manner. In this case it enabled us to treat early with oxygen therapy, interscalene catheter removal, and intensive surveillance.

Human prostasomes from normozoospermic and non-normozoospermic men show a differential protein expression pattern.

Prostasomes are exosomes such as extracellular vesicles, produced in the prostatic epithelium and released into the seminal plasma, that play an important role enhancing male fertility. Although some studies have demonstrated that prostasomes have a rich proteomic content, it is still unclear if that proteomic content varies depending on the male fertility status. Prostasomes from 12 normozoospermic and 14 non-normozoospermic seminal samples were isolated by differential ultracentrifugation. Protein content was studied by quantitative mass spectrometry and compared between both cohorts. We identified 1282 proteins with 745 of them (57.8%) being present in all seven prostasome pools. Forty-seven of those commonly present proteins showed differential expression levels in both cohorts. Specifically, prostasomes from non-normozoospermic samples showed a pattern of protein underexpression for a group of proteins including several proteins from the spermatozoa's energy production pathways as well as some proteins directly implicated in sperm activity. Variations in prostasomal protein content levels may have a relevant correlation with male fertility and thus could be of great utility as a biomarker of fertility status.

Effect of cooling rate on sperm quality of cryopreserved Andalusian donkey spermatozoa.

The aim of this study was to evaluate the effect of different cooling rates on post-thaw quality of cryopreserved donkey spermatozoa. Eighteen ejaculates from six adult Andalusian donkeys (three ejaculates per donkey) were collected using an artificial vagina. Pooled semen samples (two ejaculates per pool) were divided into three aliquots, and frozen in Gent freezing extender using three different cryopreservation protocols (P): P1 (conventional slow freezing, as control): semen pre-cooled in an Equitainer for 2 h and frozen in liquid nitrogen (LN2) vapour; P2 (controlled pre-freeze cooling rate): semen pre-cooled at a controlled rate for 73 min and frozen in LN2 vapour; and P3 (rapid freezing) semen frozen immediately in LN2 vapour. After thawing at 37 °C for 30 s, semen samples were assessed for motility, morphology, acrosome and plasma membrane integrity; spermatozoa were also tested for DNA integrity. Significant (P < 0.01) differences were found between the cryopreservation protocols for all sperm parameters evaluated, except for DNA integrity. Semen samples frozen using P2 showed significantly (P < 0.01) higher values for sperm motility, morphology, sperm membrane integrity, and acrosome integrity. On the contrary, P3 reduced sperm motility (P < 0.01) and increased the percentage of spermatozoa with damaged plasma membrane (P < 0.001). In our study, we demonstrated that the sperm of Andalusian donkey is particularly sensitive to the cooling rate used before freezing. Furthermore, Andalusian donkey semen can be successfully cryopreserved using controlled cooling rates combined with freezing in LN2 vapour.

Sperm DNA fragmentation in donors and normozoospermic patients attending for a first spermiogram: Static and dynamic assessment.

Static assessment of sperm DNA Fragmentation (SDF at the time of ejaculation or sperm thawing when cryopreserved) and the dynamic assessment of SDF (SDF assessed after T2 hr, T6 hr and T24 hr of sperm thawing) were used to establish cut-off values associated with sperm donors when compared with closely related normozoospermic patients. Cryopreserved samples from donors revealed SDF levels two times lower in comparison with the patients. Donor sperm DNA exhibited a 2.5 times higher longevity when compared with the patients. Static values of SDF after thawing of approximately 11% identify the donors with a 71% of sensitivity and 84% specificity. With respect to the dynamic assessment, SDF increases of 2.3 per hr during the first 2 hr of incubation identify the donors with 70% of sensitivity and 66% of specificity. Creating the Rate of Combined Damage (RCD) defined as the product of SDF-T0 by the increase in the damage registered during the first 2 hr of incubation (r-SDF-T0-2 ), an index of RCD = 22.2 units has an identification capacity of donors with a 78% sensitivity and 77% specificity. Such cut-off values could be used to characterise donors with high chromatin resistance to damage when meeting the above-established criteria.

Cryoprotective effect of glutamine, taurine, and proline on post-thaw semen quality and DNA integrity of donkey spermatozoa.

This study was conducted to evaluate the effect of amino acid addition to semen on post-thaw quality of donkey spermatozoa. Eighteen ejaculates were pooled and divided into aliquots which were cryopreserved in Gent A® containing 1% ethylene glycol (Gent-EG) and supplemented with 0 (as control), 20, 40, or 60 mM of glutamine, proline, or taurine. The greatest concentration (60 mM) of glutamine and taurine resulted in greater (P < 0.001) post-thaw sperm motility. Amino acid supplementation did not improve (P > 0.05) sperm morphology and membrane plasma integrity compared with the control samples. Whereas, improvement (P < 0.05) of acrosome integrity was observed with use of 60 mM glutamine. After thawing, there were no differences (P > 0.05) in the sperm DNA fragmentation index (sDFI) among treatments. The 60 mM glutamine and 40 mM taurine treatments, however, resulted in a reduction (P < 0.05) in sDFI values in the first 6 h of semen incubation, compared with the control samples. At 24 h, the sDFI values were less (P < 0.05) in all supplemented as compared with control samples, except for the 20 mM proline treatment group. In conclusion, supplementation of the Gent-EG extender with glutamine or taurine at 60 mM improved post-thaw donkey sperm quality. The addition of proline to the freezing extender, however, did not provide any significant enhancement in sperm quality, compared with the control group.

Stallion sperm selection prior to freezing using a modified colloid swim-up procedure without centrifugation.

The aims of this study were to: 1) develop a new method for stallion sperm selection using a modified swim-up procedure through a colloid and 2) evaluate its impact in good quality ejaculates from bad freezers in comparison to methods involving centrifugation such as single layer centrifugation and sperm washing. Ejaculates were processed before freezing using three different procedures: sperm washing (SW), colloid single layer centrifugation (SLC) and a modified colloid swim-up (SU). After semen processing, sperm recovery rates were measured and sperm were frozen. Post-thaw sperm motility (assessed by computer-assisted sperm analysis), normal forms and plasma membrane integrity (evaluated under bright-field and fluorescence microscopy respectively), and DNA fragmentation (assessed by the Sperm-Halomax kit) were compared between treatments. Sperm recovery rates were similar between SU and SLC but lower than SW. Sperm motility after thawing was lower in SU in comparison to SLC and SW, maybe due to the incomplete removal of seminal plasma before freezing. Sperm DNA fragmentation was lower in SU and SLC selection methods, particularly in SLC selected samples during the first 6h of incubation. The remaining sperm parameters assessed were similar among treatments. In conclusion, SLC is more suitable than SW and SU to process stallion semen prior to freezing, in particular when sperm DNA damage is suspected. Further studies are needed in order to determine the potential benefits of SU in samples where centrifugation is not necessary, such as epididymal sperm, ejaculate fractioning or post-thaw semen samples.

The presence of human papillomavirus in semen does not affect the integrity of sperm DNA.

It remains unknown whether human papillomaviruses (HPVs) in semen affect sperm DNA integrity. We investigated whether the presence of these viruses in semen was associated with an elevated sperm DNA fragmentation index. Semen samples of 22 normozoospermic patients undergoing infertility treatment, nine fertile donors and seven fertile men with a risk of HPV infection (genital warts or condylomas) were included in the study. The samples were examined by an INNO-LiPA test PCR-based reverse hybridisation array that identifies 28 types of HPVs as simple or multiple infections. Sperm DNA integrity was determined by sperm chromatin dispersion assay (SCD). Our preliminary findings demonstrate an increase in HPV infection in infertile men with respect to fertile men. However, the sperm DNA fragmentation index was not increased in semen containing these viruses.

Cryopreservation of saltwater crocodile (Crocodylus porosus) spermatozoa.

The aim of the present study was to develop a protocol for the successful cryopreservation of Saltwater crocodile spermatozoa. Sperm cells were frozen above liquid nitrogen vapour in phosphate-buffered saline (PBS) containing either 0.3M trehalose, 0.3M raffinose or 0.3M sucrose and compared with glycerol (0.3-2.7M). Although the highest levels of mean post-thaw motility were observed following cryopreservation in 0.3M trehalose (7.6%) and 0.3M sucrose (7.3%), plasma membrane integrity (PI) was best following cryopreservation in 2.7M glycerol (52.5%). A pilot study then assessed the cytotoxicity of glycerol and sucrose prior to cryopreservation and revealed no loss of survival when spermatozoa were diluted in 0.68M glycerol or 0.2-0.3M sucrose once cryoprotectants were washed out with PBS or Biggers, Whitten and Whittingham medium containing sperm capacitation agents (BWWCAP). A final study refined the combined use of permeating (0.68 or 1.35M glycerol) and non-permeating (0.2 or 0.3M sucrose) cryoprotectants. Spermatozoa were cryopreserved in liquid nitrogen vapour at rates of approximately -21°Cmin-1 (fast freeze) or -6.0°Cmin-1 (slow freeze). Post-thaw survival was highest with a combination of 0.2M sucrose and 0.68M glycerol and when these cryoprotectants were washed out with BWWCAP, regardless of whether spermatozoa were frozen using a fast (motility 14.2±4.7%; PI 20.7±2.0%) or slow (motility 12.0±2.7%; PI 22±4%) cryopreservation rate.

Equivalent seminal characteristics in human and stallion at first and second ejaculated fractions.

Sperm quality was assessed in normozoospermic human (n = 10) and Spanish breed stallion (n = 10) after sperm fractionation during ejaculation. The first ejaculated fraction was separated from the second. A third sample was reconstituted using equivalent proportion of both fractions (RAW). Fraction 1, Fraction 2 and RAW semen were incubated for 30 min at 37°C to homogenise the impact of iatrogenic damage between both species. Sperm concentration, motility and sperm DNA damage were assessed in each fraction and RAW semen. The results showed two important facts: (i) spermatozoa confined at Fraction 1 exhibit superior parameters than those included at Fraction 2 in both species, and (ii) there is a certain level of concordance between species in the proportion of benefit observed when Fraction 1 is compared to RAW semen. Altogether, these results call into question whether the standard practice of whole ejaculate collection can be considered the best strategy when using male gametes for artificial insemination. In fact, the reconstituted RAW semen exhibits poorer semen characteristics than those found in Fraction 1.

The assessment of sperm DNA fragmentation in the saltwater crocodile (Crocodylus porosus).

Herein we report a method of assessing DNA fragmentation in the saltwater crocodile using the sperm chromatin dispersion test (SCDt) after including frozen-thawed spermatozoa in a microgel (Halomax; Halotech DNA, Madrid, Spain). Following controlled protein depletion, which included a reducing agent, sperm nuclei with fragmented DNA showed a homogeneous and larger halo of chromatin dispersion with a corresponding reduced nucleoid core compared with sperm with non-fragmented DNA. The presence of DNA damage was confirmed directly by incorporation of modified nucleotides using in situ nick translation (ISNT) and indirectly by studying the correlation of the SCDt with the results of DNA damage visualisation using a two-tailed comet assay (r=0.90; P=0.037). Results of the SCDt immediately following thawing and after 5h incubation at 37°C in order to induce a range of DNA damage revealed individual crocodile differences in both the baseline level of DNA damage and DNA longevity.

Effects of freezing and activation on membrane quality and DNA damage in Xenopus tropicalis and Xenopus laevis spermatozoa.

There is growing concern over the effect of sperm cryopreservation on DNA integrity and the subsequent development of offspring generated from this cryopreserved material. In the present study, membrane integrity and DNA stability of Xenopus laevis and Xenopus tropicalis spermatozoa were evaluated in response to cryopreservation with or without activation, a process that happens upon exposure to water to spermatozoa of some aquatic species. A dye exclusion assay revealed that sperm plasma membrane integrity in both species decreased after freezing, more so for X. laevis than X. tropicalis spermatozoa. The sperm chromatin dispersion (SCD) test showed that for both X. tropicalis and X. laevis, activated frozen spermatozoa produced the highest levels of DNA fragmentation compared with all fresh samples and frozen non-activated samples (P<0.05). Understanding the nature of DNA and membrane damage that occurs in cryopreserved spermatozoa from Xenopus species represents the first step in exploiting these powerful model organisms to understand the developmental consequences of fertilising with cryopreservation-damaged spermatozoa.

Differences in preservation of canine chilled semen using simple sperm washing, single-layer centrifugation and modified swim-up preparation techniques.

This study compared the efficacy of simple sperm washing (SW), single-layer centrifugation (SLC) and modified swim-up (SU) techniques in the preparation of dog spermatozoa for cooling. Eighteen ejaculates, collected from three dogs (six per dog), were pooled (three ejaculates per pool) and divided into three aliquots: (1) one aliquot was washed and cooled at 5°C for 72h, considered as control (SW-control), (2) the second aliquot was selected by SLC through Androcoll-C and subsequently cooled in the same way as the SW-control samples (SLC-AC) and (3) the last aliquot was selected by a modified SU method with Androcoll-C and cooled as mentioned above (SU-AC). Assessment of sperm motility, sperm morphology, sperm membrane integrity and acrosome integrity were performed on aliquots of fresh semen and chilled-rewarmed samples. Sperm membrane integrity and progressive motility were significantly (PPP>0.05). The recovery rates were not significantly (P>0.05) different between SW-control, SLC-AC and SU-AC samples. Our results confirm that SU-AC may be a successful method for the preparation of dog spermatozoa for cooling.

Effect of single-layer centrifugation or washing on frozen-thawed donkey semen quality: Do they have the same effect regardless of the quality of the sample?

The aims of this study were to determine the sperm quality of frozen-thawed donkey sperm samples after single-layer centrifugation (SLC) using Androcoll-E in comparison to sperm washing or no centrifugation and to determine if the effect on the sperm quality after SLC or sperm washing depends on the quality of the sample. Frozen-thawed sperm samples from Andalusian donkeys were divided into three aliquots, and they were processed using three different techniques after thawing: uncentrifuged diluted control (UDC), sperm washing (SW), and SLC. Afterward, sperm quality index was estimated by integrating all parameters (total and progressive sperm motility, membrane integrity, and DNA fragmentation) in a single value. The relationship between the sperm quality of thawed UDC samples and the effect on sperm parameters in SW and SLC-selected samples was assessed. Sperm quality index was significantly higher (P < 0.001) in SLC (0.8 ± 0.0) samples than that in UDC (0.6 ± 0.0) and SW (0.6 ± 0.0) samples, regardless of the sperm quality index after thawing of the sperm sample. In conclusion, SLC of frozen-thawed donkey spermatozoa using Androcoll-E-Small can be a suitable procedure for selecting frozen-thawed donkey sperm with better quality, in particular in those samples where an improvement in motility is needed.