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Caldevilla ML, Ferrante AA, Gambarotta MC, Miragaya MH, Neild DM. Evaluation of equine semen frozen in extenders free of egg yolk using two different freezing curves. J Equine Vet Sci 2024; 137:105080. [PMID: 38704000 DOI: 10.1016/j.jevs.2024.105080] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2023] [Revised: 03/19/2024] [Accepted: 04/29/2024] [Indexed: 05/06/2024]
Abstract
A chemically defined cryopreservation extender that maintains seminal parameters is relevant. Fifteen ejaculates from 5 stallions (n= 5; r=3) were diluted in 5 extenders: 1) EDTA-glucose based extender with egg-yolk and dimethylformamide (EY); 2) commercial equine extender (CE); 3) CE with dimethylformamide (CE-3); 4) bovine commercial extender with liposomes (OP); 5) bovine commercial extender with soybean lecithin (BIO), and frozen using a slow and a rapid temperature descent curve. Post-thaw evaluations were: sperm kinematic parameters, viability and acrosome status, membrane lipoperoxidation and DNA fragmentation. Sperm data were analysed using an ANOVA or Friedman test (results mean ± SD). Paired comparison between the two freezing curves was analysed using the Wilcoxon test. Total and progressive motility were significantly higher (P<0.05) in the EY and CE-3 samples using the slow curve, whereas for the fast curve, total and progressive motility were significantly higher (P<0.05) in the EY samples compared to all the extenders and the samples frozen in CE-3 were significantly higher than the remaining extenders (P<0.05). The percentages of live acrosome intact sperm and of live non-peroxidized sperm were significantly higher (P<0.05) in the EY extender when using either of the freezing curves and in turn, were significantly higher (P<0.05) in samples frozen in CE-3 compared to the remaining extenders. Intact DNA was significantly lower (P<0.05) in the BIO extender, using the rapid curve. To conclude, the commercial equine extender with 3% dimethylformamide, without egg-yolk, could be a suitable alternative for extenders with egg-yolk.
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Affiliation(s)
- M L Caldevilla
- Cátedra de Teriogenología, INITRA, Facultad de Ciencias Veterinarias, Universidad de Buenos Aires. Chorroarin 280, (1427), Buenos Aires, Argentina.
| | - A A Ferrante
- Cátedra de Teriogenología, INITRA, Facultad de Ciencias Veterinarias, Universidad de Buenos Aires. Chorroarin 280, (1427), Buenos Aires, Argentina
| | - M C Gambarotta
- Cátedra de Bioestadística, Facultad de Ciencias Veterinarias, Universidad de Buenos Aires. Chorroarin 280, (1427), Buenos Aires, Argentina
| | - M H Miragaya
- Cátedra de Teriogenología, INITRA, Facultad de Ciencias Veterinarias, Universidad de Buenos Aires. Chorroarin 280, (1427), Buenos Aires, Argentina
| | - D M Neild
- Cátedra de Teriogenología, INITRA, Facultad de Ciencias Veterinarias, Universidad de Buenos Aires. Chorroarin 280, (1427), Buenos Aires, Argentina
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2
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Bruno SL, Neild DM, Plaza JP, Ferrante AA, Carretero MI, Olivieri GEA, Bianchi CP, Miragaya MH. Comparison of different cryoprotectants for freezing donkey (Equus asinus) semen. J Equine Vet Sci 2024; 136:105069. [PMID: 38599258 DOI: 10.1016/j.jevs.2024.105069] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2023] [Revised: 04/05/2024] [Accepted: 04/06/2024] [Indexed: 04/12/2024]
Abstract
The aim of this study was to evaluate two cryoprotectants, dimethylformamide (DMF) and methylformamide (MF) in two concentrations (5 and 7%) in vitro in donkey semen using a rapid freezing technique and the effect on pregnancy rates in mares. Twenty-four ejaculates from 8 jacks (n=8; r=3) were divided into 4 extenders: BotuSemen Gold with 5% or 7% MF and 5% or 7% DMF, all containing 11% lactose, 20% egg-yolk and 0.5% Equex. Post-thaw evaluations included: sperm motility, membrane function and acrosome status. A linear mixed effect model was used to test the effect of different freezing media on semen parameters. No differences were observed between the 4 freezing media used, for any of the seminal parameters (P>0.05). However, samples with 5% DMF showed the highest percentages of sperm with acrosomes and functional membranes (DMF: 5%: 53.67±22.01; 7%: 33.92±23.4; MF: 5%: 44.5±20.46; 7%: 38.75±27.4) (Data: mean ± SD; P>0.05). Hence, thirty mares were inseminated: 15 with 5% DMF and 15 with 7% DMF. The pregnancy rate was 46% (7/15) and 0% (0/15) using the extender with 5% or 7% DMF, respectively (P=0.003). To conclude, the use of 5% or 7% of MF or DMF did not affect the in vitro parameters. Despite the lack of differences in vitro with the two DMF concentrations, in vivo results only showed pregnancies when using 5% DMF. Thus, the results of this study demonstrate the importance of accompanying in vitro semen evaluations with studies that evaluate post-insemination pregnancy rates.
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Affiliation(s)
- S L Bruno
- Haras Militar "General Lavalle", Dirección de Remonta y Veterinaria, Ejército Argentino, Sección Chacras, Tandil, Buenos Aires, CP7000, Argentina
| | - D M Neild
- Cátedra de Teriogenología, Instituto de Investigación y Tecnología en Reproducción Animal (INITRA), Universidad de Buenos Aires, Avenida Chorroarín 280, Ciudad Autónoma de Buenos Aires, Buenos Aires, C1427CWO, Argentina
| | - J P Plaza
- Cátedra de Teriogenología, Instituto de Investigación y Tecnología en Reproducción Animal (INITRA), Universidad de Buenos Aires, Avenida Chorroarín 280, Ciudad Autónoma de Buenos Aires, Buenos Aires, C1427CWO, Argentina; Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Godoy Cruz 2290 Ciudad Autónoma de Buenos Aires, Buenos Aires, C1425FQB, Argentina.
| | - A A Ferrante
- Cátedra de Teriogenología, Instituto de Investigación y Tecnología en Reproducción Animal (INITRA), Universidad de Buenos Aires, Avenida Chorroarín 280, Ciudad Autónoma de Buenos Aires, Buenos Aires, C1427CWO, Argentina
| | - M I Carretero
- Cátedra de Teriogenología, Instituto de Investigación y Tecnología en Reproducción Animal (INITRA), Universidad de Buenos Aires, Avenida Chorroarín 280, Ciudad Autónoma de Buenos Aires, Buenos Aires, C1427CWO, Argentina; Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Godoy Cruz 2290 Ciudad Autónoma de Buenos Aires, Buenos Aires, C1425FQB, Argentina
| | - G E A Olivieri
- Haras Militar "General Lavalle", Dirección de Remonta y Veterinaria, Ejército Argentino, Sección Chacras, Tandil, Buenos Aires, CP7000, Argentina
| | - C P Bianchi
- Centro de Investigación Veterinaria de Tandil (CIVETAN), UNCPBA-CONICET-CICPBA, Facultad de Ciencias Veterinarias, Universidad Nacional del Centro de la provincia de Buenos Aires, Campus Universitario Tandil, Provincia de Buenos Aires, B7000GHG, Argentina; Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Godoy Cruz 2290 Ciudad Autónoma de Buenos Aires, Buenos Aires, C1425FQB, Argentina
| | - M H Miragaya
- Cátedra de Teriogenología, Instituto de Investigación y Tecnología en Reproducción Animal (INITRA), Universidad de Buenos Aires, Avenida Chorroarín 280, Ciudad Autónoma de Buenos Aires, Buenos Aires, C1427CWO, Argentina
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3
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Allera C, Gallelli MF, Neild DM, Carretero MI. Evaluation of DNA integrity and chromatin condensation in cat sperm collected by urethral catheterization and epididymis slicing. Reprod Domest Anim 2023. [PMID: 37191500 DOI: 10.1111/rda.14388] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2023] [Revised: 04/15/2023] [Accepted: 04/27/2023] [Indexed: 05/17/2023]
Abstract
OBJECTIVES evaluate the effectiveness of the original Sperm Chromatin Dispersion (SCD) assay and the Toluidine Blue (TB) stain to assess DNA fragmentation and chromatin condensation respectively, in cat sperm obtained by urethral catheterization (CT) and epididymis slicing (EP). CT and EP samples were collected from the same cat and sperm motility, concentration, morphology, DNA integrity and chromatin condensation were evaluated. As controls, aliquots of the samples were incubated with 0.3 M NaOH and with 1% of dithiothreitol (DTT) to promote DNA fragmentation and chromatin decondensation, respectively. With SCD, four DNA dispersion halo patterns were observed: large, medium, small and no halo. TB staining patterns were: light blue (condensed chromatin), light violet (moderate chromatin decondensation) and dark blue-violet (high chromatin decondensation). Sperm incubations with NaOH and with DTT were effective to induce DNA fragmentation and chromatin decondensation, respectively. No significant differences were observed in the percentages of the SCD and TB patterns between samples (CT and EP) and no correlation was observed between sperm head abnormalities and the different SCD and TB patterns. The original SCD technique and the TB stain were adapted to evaluate DNA integrity and chromatin condensation in cat sperm obtained by CT and EP.
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Affiliation(s)
- Cecilia Allera
- Instituto de Investigación y Tecnología en Reproducción Animal (INITRA), Facultad de Ciencias Veterinarias, Universidad de Buenos Aires, Bs. As., Argentina
| | - María Florencia Gallelli
- Instituto de Investigación y Tecnología en Reproducción Animal (INITRA), Facultad de Ciencias Veterinarias, Universidad de Buenos Aires, Bs. As., Argentina
- Consejo Nacional de Investigaciones Científicas y Técnicas, Bs. As., Argentina
| | - Deborah Margarita Neild
- Instituto de Investigación y Tecnología en Reproducción Animal (INITRA), Facultad de Ciencias Veterinarias, Universidad de Buenos Aires, Bs. As., Argentina
| | - María Ignacia Carretero
- Instituto de Investigación y Tecnología en Reproducción Animal (INITRA), Facultad de Ciencias Veterinarias, Universidad de Buenos Aires, Bs. As., Argentina
- Consejo Nacional de Investigaciones Científicas y Técnicas, Bs. As., Argentina
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Ferrante AA, Arraztoa CC, Plaza JP, Gambini A, Castex CB, Rodriguez MB, Brisky O, Bruno S, Olivieri G, Miragaya MH, Neild DM. The efficiency of transvaginal oocyte aspiration in Remonta Argentino jennies. J Equine Vet Sci 2022. [DOI: 10.1016/j.jevs.2022.103996] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Monachesi NE, Gallelli MF, Neild DM, Carretero MI. Evaluation of DNA fragmentation in dog sperm using the sperm chromatin dispersion test. Reprod Domest Anim 2022; 57:893-901. [PMID: 35474618 DOI: 10.1111/rda.14136] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2021] [Revised: 04/04/2022] [Accepted: 04/25/2022] [Indexed: 11/28/2022]
Abstract
The study's objective was to adapt the Sperm Chromatin Dispersion (SCD) protocol to evaluate sperm DNA fragmentation and implement a fragmentation control in dogs. Correlation between DNA status and routine sperm parameters was also analysed. To adapt the SCD, two different mercaptoethanol (ME) concentrations were assayed (2.5 and 5%) in fourteen ejaculates from seven dogs and semen incubation with 0.3 M NaOH for 15 min at room temperature was assayed as a control for sperm DNA fragmentation. Data were analysed using a Mann-Whitney test and either Pearson's or Spearman's correlation. The selected ME concentration to use in the SCD test was 5%, as it produced the largest DNA dispersion halo while preserving the core nucleus structure. Four DNA halo patterns were identified: large dispersion halos, medium halos, small halos and nuclei without halos. Semen incubated with NaOH showed 100% sperm without halos (damaged DNA). A significant positive correlation was observed between sperm with fragmented DNA and sperm with coiled tails. Thus, it was possible to adapt the SCD protocol to evaluate dog sperm DNA fragmentation in raw semen without using a commercial kit and establish incubation with NaOH as a DNA fragmentation control. Only coiled tails showed correlation with DNA fragmentation.
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Affiliation(s)
- Norma Estela Monachesi
- Universidad de Buenos Aires, Facultad de Ciencias Veterinarias, Instituto de Investigación y Tecnología en Reproducción Animal, Argentina
| | - María Florencia Gallelli
- Universidad de Buenos Aires, Facultad de Ciencias Veterinarias, Instituto de Investigación y Tecnología en Reproducción Animal, Argentina.,Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires, Argentina
| | - Deborah Margarita Neild
- Universidad de Buenos Aires, Facultad de Ciencias Veterinarias, Instituto de Investigación y Tecnología en Reproducción Animal, Argentina
| | - María Ignacia Carretero
- Universidad de Buenos Aires, Facultad de Ciencias Veterinarias, Instituto de Investigación y Tecnología en Reproducción Animal, Argentina.,Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires, Argentina
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Arraztoa CC, Miragaya MH, Chaves MG, Carretero MI, Santa Cruz RC, Giuliano SM, Gambarotta MC, Neild DM. Cryoprotectant-free vitrification of llama spermatozoa: cryoloop vs sphere method, warmed rapidly or ultra-rapidly. Small Rumin Res 2022. [DOI: 10.1016/j.smallrumres.2021.106576] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Carretero MI, Arraztoa CC, Fumuso FG, Chaves MG, Santa Cruz RC, Neild DM. Dehydration of llama sperm using different osmolarity media and temperatures for preservation. Anim Reprod Sci 2020; 225:106683. [PMID: 33388611 DOI: 10.1016/j.anireprosci.2020.106683] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2020] [Revised: 12/16/2020] [Accepted: 12/17/2020] [Indexed: 11/26/2022]
Abstract
The objective of this study was to evaluate effects of dehydration on sperm DNA with the aim of eventually using this method for preserving llama spermatozoa. Two experiments were conducted: 1) sperm preservation at 5 °C for 60 days in different hyperosmotic solutions (500, 800, 1000 and 1200 mOsmol/l) (n = 6, replications = 2) and 2) sperm preservation at 5 and -20 °C for 60 days in the same hyperosmotic solutions, with supplementary antibiotics (n = 6, replications = 2). Sperm motility, membrane functional integrity, viability and morphology were evaluated at 0 and 48 h of the preservation period (Experiment 1) and at 30 min and 24 h (Experiment 2). Sperm DNA was evaluated at 0 or 30 min (Experiment 1 and 2, respectively) and on days 7, 14, 21, 30 and 60 of the preservation periods. Motility, membrane functional integrity and viability were less when sperm were dehydrated, while sperm cell morphology was not affected. There was a smaller percentage of sperm with condensed chromatin as duration of the preservation period increased when stored in the different hyperosmotic solutions. There was a markedly smaller (P < 0.05) percentage of sperm with intact DNA in all solutions as the duration of preservation increased, with there being greater values for intact DNA at -20 °C than sperm preserved at 5 °C. Llama sperm chromatin condensation was slightly affected by the process of dehydration. There was a markedly smaller percentage of sperm with intact DNA in the dehydrated semen samples.
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Affiliation(s)
- María Ignacia Carretero
- Universidad de Buenos Aires, Facultad de Ciencias Veterinarias, Instituto de Investigación y Tecnología en Reproducción Animal, Argentina; Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires, Argentina.
| | - Claudia Cecilia Arraztoa
- Universidad de Buenos Aires, Facultad de Ciencias Veterinarias, Instituto de Investigación y Tecnología en Reproducción Animal, Argentina
| | - Fernanda Gabriela Fumuso
- Universidad de Buenos Aires, Facultad de Ciencias Veterinarias, Instituto de Investigación y Tecnología en Reproducción Animal, Argentina; Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires, Argentina
| | - María Graciela Chaves
- Universidad de Buenos Aires, Facultad de Ciencias Veterinarias, Instituto de Investigación y Tecnología en Reproducción Animal, Argentina
| | - Romina Carla Santa Cruz
- Universidad de Buenos Aires, Facultad de Ciencias Veterinarias, Instituto de Investigación y Tecnología en Reproducción Animal, Argentina
| | - Deborah Margarita Neild
- Universidad de Buenos Aires, Facultad de Ciencias Veterinarias, Instituto de Investigación y Tecnología en Reproducción Animal, Argentina
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Carretero MI, Chaves MG, Arraztoa CC, Fumuso FG, Gambarotta MC, Neild DM. Air-Drying Llama Sperm Affects DNA Integrity. Front Vet Sci 2020; 7:597952. [PMID: 33363235 PMCID: PMC7758352 DOI: 10.3389/fvets.2020.597952] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2020] [Accepted: 11/19/2020] [Indexed: 11/30/2022] Open
Abstract
The objective of this study was to evaluate the effects of air-drying preservation on llama sperm DNA. Semen collections were carried out using electroejaculation under general anesthesia. A total of 16 ejaculates were processed from 4 males (n = 4, r = 4). Each sample was diluted 4:1 in a collagenase solution in TALP media, then incubated and centrifuged at 800 g for 8 min. The pellet was re-suspended to a concentration of 20 million sperm/ml in TALP. Then the samples were placed onto sterile slides forming lines and were left to dry under laminar flow for 15 min. After this, the slides were placed into Falcon centrifuge tubes and kept at 5°C. Sperm characteristics (motility, membrane function, viability and morphology) were evaluated in raw semen and in the air-dried samples kept at 5°C for 30 min. DNA evaluation (integrity and degree of chromatin condensation) was carried out in raw semen and in the air-dried samples after 30 min, 7, 14, 21, 30, and 60 days after preservation. To compare raw semen to the air-dried samples, a Wilcoxon test was used for all sperm characteristics except for DNA, where a paired Student t-test was applied. A split plot design was used to compare chromatin condensation between the different periods of preservation and a Kruskal Wallis test was used to compare DNA integrity. Motility, membrane function, viability and sperm with intact DNA decreased in the air-dried samples (p < 0.05), while morphology and chromatin condensation were not affected (p > 0.05). No significant differences were observed in the percentage of sperm with condensed chromatin between the different periods of preservation (p > 0.05). On the other hand, a significant decrease in the percentage of sperm with intact DNA was observed as from day 7 of preservation (p < 0.05). In conclusion the air-drying process has a negative effect on llama sperm DNA, hence the media used will need to be improved to protect DNA and be able to implement this technique in this species.
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Affiliation(s)
- María Ignacia Carretero
- Facultad de Ciencias Veterinarias, Universidad de Buenos Aires, Buenos Aires, Argentina.,Instituto de Investigación y Tecnología en Reproducción Animal, Universidad de Buenos Aires, Buenos Aires, Argentina.,Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires, Argentina
| | - María Graciela Chaves
- Facultad de Ciencias Veterinarias, Universidad de Buenos Aires, Buenos Aires, Argentina.,Instituto de Investigación y Tecnología en Reproducción Animal, Universidad de Buenos Aires, Buenos Aires, Argentina
| | - Claudia Cecilia Arraztoa
- Facultad de Ciencias Veterinarias, Universidad de Buenos Aires, Buenos Aires, Argentina.,Instituto de Investigación y Tecnología en Reproducción Animal, Universidad de Buenos Aires, Buenos Aires, Argentina
| | - Fernanda Gabriela Fumuso
- Facultad de Ciencias Veterinarias, Universidad de Buenos Aires, Buenos Aires, Argentina.,Instituto de Investigación y Tecnología en Reproducción Animal, Universidad de Buenos Aires, Buenos Aires, Argentina.,Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires, Argentina
| | | | - Deborah Margarita Neild
- Facultad de Ciencias Veterinarias, Universidad de Buenos Aires, Buenos Aires, Argentina.,Instituto de Investigación y Tecnología en Reproducción Animal, Universidad de Buenos Aires, Buenos Aires, Argentina
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Zampini EG, Veiga MF, Fumuso FG, Cabido L, Neild DM, Chaves MG, Miragaya MH, Trasorras VL. Development of a GnRH-PGF 2α Based Synchronization and Superstimulation Protocol for Fixed-Time Mating in Llama Embryo Donors. Front Vet Sci 2020; 7:595889. [PMID: 33282933 PMCID: PMC7688663 DOI: 10.3389/fvets.2020.595889] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2020] [Accepted: 10/23/2020] [Indexed: 12/03/2022] Open
Abstract
The aim of the present study was to evaluate the application of a GnRH-PGF2α based synchronization and superstimulation protocol for fixed-time natural mating in llama embryo donors. All females (n = 8) received 8 μg IM of GnRH analog (GnRHa; buserelin) on day 0, regardless of follicular status. After eight days, another GnRHa dose was administered followed by 250 μg IM PGF2α (cloprostenol). A dose of 1000 IU IM of equine chorionic gonadotrophin (eCG) was applied on day 12 and a new dose of PGF2α was administered on day 13. All embryo donors were mated with a male of proven fertility followed by a GnRHa dose on day 18. 24 h later, mating was repeated with a different male. Transcervical uterine flushing for embryo recovery was carried out on all females on day 26. Recipient females received one dose of GnRHa (day 0) two days after the first mating of embryo donor females. A 75% (6/8) of embryo donors responded to the superstimulation treatment with a range of 2 to 5 corpus luteums (CLs) on embryo recovery day. A total of 24 CLs were registered, with a mean of 4 ± 0.9 CLs per female. Embryo recovery rate was 66.7% (16/24), with a range of 0 to 4 embryos and a mean of 2.7 ± 1.5 embryos per female. Regarding quality of the recovered embryos, 56.2% were grade I, 6.2% were grade II and 37.5% were grade V (untransferable; arrested morulae). Grade I and II embryos (n = 10) were transcervically transferred into recipient females (n = 10) six days after inducing their ovulation. At 24 days after embryo transfer (ET), a 50% pregnancy rate was registered. In conclusion, a group of llama embryo donors can be synchronized and superstimulated using a fixed-time mating protocol based on GnRHa, PGF2α, and eCG without the necessity of using ultrasonography in the field.
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Affiliation(s)
- Enzo German Zampini
- Universidad de Buenos Aires, Facultad de Ciencias Veterinarias, Instituto de Investigación y Tecnología en Reproducción Animal, Cátedra de Teriogenología, Buenos Aires, Argentina
- Consejo Nacional de Investigaciones Científicas y Técnicas, Buenos Aires, Argentina
| | - Maria Fernanda Veiga
- Universidad de Buenos Aires, Facultad de Ciencias Veterinarias, Instituto de Investigación y Tecnología en Reproducción Animal, Cátedra de Teriogenología, Buenos Aires, Argentina
| | - Fernanda Gabriela Fumuso
- Universidad de Buenos Aires, Facultad de Ciencias Veterinarias, Instituto de Investigación y Tecnología en Reproducción Animal, Cátedra de Teriogenología, Buenos Aires, Argentina
- Consejo Nacional de Investigaciones Científicas y Técnicas, Buenos Aires, Argentina
| | - Luciana Cabido
- Dirección Provincial de Desarrollo Ganadero, Gobierno de la Provincia de Jujuy, Jujuy, Argentina
| | - Deborah Margarita Neild
- Universidad de Buenos Aires, Facultad de Ciencias Veterinarias, Instituto de Investigación y Tecnología en Reproducción Animal, Cátedra de Teriogenología, Buenos Aires, Argentina
| | - Maria Graciela Chaves
- Universidad de Buenos Aires, Facultad de Ciencias Veterinarias, Instituto de Investigación y Tecnología en Reproducción Animal, Cátedra de Teriogenología, Buenos Aires, Argentina
| | - Marcelo Horacio Miragaya
- Universidad de Buenos Aires, Facultad de Ciencias Veterinarias, Instituto de Investigación y Tecnología en Reproducción Animal, Cátedra de Teriogenología, Buenos Aires, Argentina
| | - Virginia Luz Trasorras
- Universidad de Buenos Aires, Facultad de Ciencias Veterinarias, Instituto de Investigación y Tecnología en Reproducción Animal, Cátedra de Teriogenología, Buenos Aires, Argentina
- Consejo Nacional de Investigaciones Científicas y Técnicas, Buenos Aires, Argentina
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Carretero MI, Giuliano MS, Neild DM. Evaluación de la calidad del ADN espermático en camélidos sudamericanos y otras especies domésticas. SPERMOVA 2017. [DOI: 10.18548/aspe/0005.04] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
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Arraztoa CC, Baca Castex C, Alvarez GM, Cetica PD, Neild DM. In vitro production of porcine zygotes using intracytoplasmic injection of vitrified sperm. Reprod Domest Anim 2017; 52:775-780. [DOI: 10.1111/rda.12978] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2016] [Accepted: 03/07/2017] [Indexed: 12/15/2022]
Affiliation(s)
- CC Arraztoa
- Facultad de Ciencias Veterinarias; Cátedra de Teriogenología; Instituto de Investigación y Tecnología en Reproducción Animal (INITRA-UBA); Universidad de Buenos Aires; Buenos Aires Argentina
| | - C Baca Castex
- Facultad de Ciencias Veterinarias; Cátedra de Teriogenología; Instituto de Investigación y Tecnología en Reproducción Animal (INITRA-UBA); Universidad de Buenos Aires; Buenos Aires Argentina
| | - GM Alvarez
- Facultad de Ciencias Veterinarias; Cátedra de Química Biológica; Unidad Ejecutora de Investigación en Producción Animal (INPA, UBA-CONICET); Instituto de Investigación y Tecnología en Reproducción Animal (INITRA-UBA); Universidad de Buenos Aires; Buenos Aires Argentina
| | - PD Cetica
- Facultad de Ciencias Veterinarias; Cátedra de Química Biológica; Unidad Ejecutora de Investigación en Producción Animal (INPA, UBA-CONICET); Instituto de Investigación y Tecnología en Reproducción Animal (INITRA-UBA); Universidad de Buenos Aires; Buenos Aires Argentina
| | - DM Neild
- Facultad de Ciencias Veterinarias; Cátedra de Teriogenología; Instituto de Investigación y Tecnología en Reproducción Animal (INITRA-UBA); Universidad de Buenos Aires; Buenos Aires Argentina
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Neild DM, Brouwers JFHM, Colenbrander B, Agüero A, Gadella BM. Lipid peroxide formation in relation to membrane stability of fresh and frozen thawed stallion spermatozoa. Mol Reprod Dev 2005; 72:230-8. [PMID: 15948163 DOI: 10.1002/mrd.20322] [Citation(s) in RCA: 73] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
In this study we used a new method to detect reactive oxygen species (ROS) induced damage at the level of the sperm plasma membrane in fresh and frozen-thawed stallion sperm. Lipid peroxidation (LPO) in sperm cells was assessed by a fluorescent assay involving the labeling of stallion sperm with the LPO reporter probe C11-BODIPY(581/591). The peroxidation dependent spectral emission shift of this membrane probe could be localized using inverted spectral confocal microscopy and quantified on living and deteriorated sperm cells using flow cytometry. Mass spectrometric analysis of the main endogenous lipid class, phosphatidylcholine (PC), was carried out to determine the formation of hydroxy- and hydroperoxyphosphatidylcholine in fresh sperm cells. Peroxidation as reported by the fluorescent probe corresponded with the presence of hydroxy- and hydroperoxyphosphatidylcholine in the sperm membranes, which are early stage products of LPO. This allowed us to correlate endogenous LPO with localization of this process in the living sperm cells. In absence of peroxidation inducers, only relatively little peroxidation was noted in fresh sperm cells whereas some mid-piece specific probe oxidation was noted for frozen-thawed sperm cells. After induction of peroxidation in fresh and frozen-thawed sperm cells with the 0.1 mM of lipid soluble ROS tert-butylhydrogen peroxide (t-BUT) intense probe oxidation was produced in the mid-piece, whereas the probe remained intact in the sperm head, demonstrating antioxidant activity in the head of fresh sperm cells. At higher levels of t-BUT, probe peroxidation was also noted for the sperm head followed by a loss of membranes there. Frozen-thawed sperm were more vulnerable to t-BUT than fresh sperm. The potential importance of the new assays for sperm assessments is discussed.
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Affiliation(s)
- D M Neild
- Department of Medicine, School of Veterinary Sciences, University of Buenos Aires, Argentina
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Abstract
The hypo-osmotic test has been used successfully on equine semen and was considered to be a simple and accessible method which could be a useful addition to routine equine semen analysis. It was therefore of interest to determine whether the hypo-osmotic test is significantly correlated to proposed criteria of fertility. The stallions were divided into two groups on the basis of threshold levels of fertility. A significant difference (P<0.05) was found between the two groups for the following parameters: progressive motility, morphologically normal spermatozoa, percentage of swelling with the hypo-osmotic test, percentage of pregnant mares and number of services per pregnancy. The hypo-osmotic test provided a simple evaluation of membrane function and the results obtained show stallions with low swelling scores (<40%) to be of doubtful fertility. The hypo-osmotic test was not correlated with percentage of pregnant mares but showed a tendency to correlate with the number of services per pregnancy, therefore it could be an additional method for evaluating stallion fertility. Further studies are needed to confirm this observation.
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Affiliation(s)
- D M Neild
- Area of Theriogenology, Faculty of Veterinary Sciences, University of Buenos Aires, Argentina
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