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Abril-Parreño L, Krogenæs A, Fair S. Lipidomic profiling of cervical mucus reveals the potential role of pro-inflammatory derived metabolites on sperm transport across the ovine cervix. Animal 2024; 18:101136. [PMID: 38626706 DOI: 10.1016/j.animal.2024.101136] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2024] [Revised: 03/12/2024] [Accepted: 03/14/2024] [Indexed: 04/18/2024] Open
Abstract
Internationally, cervical artificial insemination (AI) in sheep yields low pregnancy rates when frozen-thawed semen is used. An exception to this is in Norway where vaginal AI of frozen-thawed semen to a natural oestrus yields non-return rates in excess of 60%, which has been attributed to the ewe breed used in Norway. This study used both metabolomics and an RNA-sequencing approach to assess the lipid production and composition from cervical mucus and tissue of four European ewe breeds (n = 28-30 ewes per breed) with previously reported differences in pregnancy rates following cervical AI with frozen-thawed semen. These breeds included Suffolk (exhibiting low fertility), Belclare (medium fertility) as well as Norwegian White Sheep and Fur (both with high fertility and pregnancy rates > 60%) at both a synchronised and natural oestrous cycle. The aim was to explore the differences between ewe breeds in the lipidomic profile and to identify candidate biomarkers associated with an optimal environment for cervical sperm transport. The results revealed the identification of 255 lipids, of which 170, 102 and 83 were different between ewe breeds, types of cycle and affected by their interaction, respectively (P < 0.05). Reduced levels of lipids involved in the resolution of inflammation (i.e. 14-HDoHE,17-HDoHE, 15-HETE) were identified in the low-fertility Suffolk breed compared to high-fertility ewe breeds. However, there was an up-regulation of the COX pathway accompanied by increased levels of prostaglandins in the Suffolk breed. These findings indicated a sub-optimal and pro-inflammatory environment that could have a negative effect on cervical sperm transport.
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Affiliation(s)
- Laura Abril-Parreño
- Laboratory of Animal Reproduction, Department of Biological Sciences, Biomaterials Research Cluster, Bernal Institute, Faculty of Science and Engineering. University of Limerick, V94 T9PX Limerick, Ireland
| | - Anette Krogenæs
- Faculty of Veterinary Medicine, Norwegian University of Life Sciences, 5003 1432 Ås, Norway
| | - Sean Fair
- Laboratory of Animal Reproduction, Department of Biological Sciences, Biomaterials Research Cluster, Bernal Institute, Faculty of Science and Engineering. University of Limerick, V94 T9PX Limerick, Ireland.
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Abril-Parreño L, Druart X, Fair S, Krogenaes A. Metabolic signature of cervical mucus in ewe breeds with divergent cervical sperm transport: a focus on metabolites involved in amino acid metabolism. Metabolomics 2023; 19:59. [PMID: 37338596 DOI: 10.1007/s11306-023-02021-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/12/2022] [Accepted: 05/23/2023] [Indexed: 06/21/2023]
Abstract
INTRODUCTION Cervical artificial insemination (AI) with frozen-thawed semen in sheep has yielded unacceptably low pregnancy rates. The exception is in Norway where vaginal AI yields non-return rates in excess of 60%, which has been attributed to the ewe breed used. OBJECTIVES AND METHODS This study aimed to characterise, for the first time, the ovine follicular phase cervical mucus metabolome, with a focus on the amino acid profile. Cervical mucus was collected from four European ewe breeds with known differences in pregnancy rates following cervical AI with frozen-thawed semen. These were Suffolk (low fertility), Belclare (medium fertility), Norwegian White Sheep (NWS) and Fur (both high fertility). RESULTS A total of 689 metabolites were identified in the cervical mucus of all the four ewe breeds. Of these, 458 metabolites were altered by ewe breed, which had the greatest effect in the dataset (P < 0.05). We detected 194 metabolites involved in the amino acid pathway, of which 133, 56 and 63 were affected by ewe breed, type of cycle and their interaction, respectively (P < 0.05). N-methylhydantoin and N-carbamoylsarcosine (degradation products of creatinine pathway) exhibited the greatest fold change decrease in the Suffolk breed compared to Fur and NWS (P < 0.001). Oxidized metabolites were also decreased in Suffolk compared to high fertility breeds (P < 0.05). In contrast, other metabolites such as 3-indoxyl-sulfate, putrescine, cadaverine were significantly increased in Suffolk at the synchronised cycle. CONCLUSION The suboptimal amino acid profile in the cervical mucus of the low fertility Suffolk breed may have negative consequences for sperm transport.
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Affiliation(s)
- Laura Abril-Parreño
- Laboratory of Animal Reproduction, Department of Biological Sciences, School of Natural Sciences, Biomaterials Research Cluster, Bernal Institute, Faculty of Science and Engineering, University of Limerick, V94 T9PX, Limerick, Ireland
| | - Xavier Druart
- Station de Physiologie de la Reproduction et des Comportements, UMR 6175 INRA, CNRS-Université de Tours-Haras Nationaux, Institut National de la Recherche Agronomique, 37380, Nouzilly, France
| | - Sean Fair
- Laboratory of Animal Reproduction, Department of Biological Sciences, School of Natural Sciences, Biomaterials Research Cluster, Bernal Institute, Faculty of Science and Engineering, University of Limerick, V94 T9PX, Limerick, Ireland
| | - Anette Krogenaes
- Faculty of Veterinary Medicine, Norwegian University of Life Sciences, 5003 1432, Ås, Norway.
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Abril-Parreño L, Krogenæs AK, Druart X, Cormican P, Fair S, Meade KG. Cervical immune activation during the luteal phase may compromise subsequent trans-cervical ram sperm transport. Biol Reprod 2022; 107:967-976. [PMID: 35766421 PMCID: PMC9562110 DOI: 10.1093/biolre/ioac130] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2022] [Revised: 06/16/2022] [Accepted: 06/18/2022] [Indexed: 11/16/2022] Open
Abstract
Worldwide, cervical artificial insemination using frozen–thawed semen yields low pregnancy rates. The only exception to this is in Norway, where vaginal insemination with frozen–thawed semen yields pregnancy rates in excess of 60% and which has been attributed to the specific ewe breed used. Our previous work demonstrated differences in cervical gene expression at the follicular phase of the estrous cycle in ewe breeds with known differences in pregnancy rates. In this study, we characterized the cervical transcriptome of the same ewe breeds [Suffolk, Belclare, Fur, and Norwegian White Sheep (NWS)] during the luteal phase, as an optimal environment at the luteal phase could better prepare the cervix for sperm migration through the cervix at the subsequent follicular phase. High-quality RNA extracted from postmortem cervical tissue was analyzed by RNA sequencing. After stringent filtering, 1051, 1924, and 611 differentially expressed genes (DEGs) were detected in the low-fertility Suffolk breed compared with Belclare, Fur, and NWS, respectively. Gene ontology analysis identified increased humoral adaptive immune response pathways in Suffolk. Increased expression of multiple immune genes supports the presence of an active immune response in the cervix of Suffolk ewes, which differentiates them significantly from the other three ewe breeds. Inflammatory pathways were upregulated in the Suffolk, resulting in higher expression of the potent pro-inflammatory cytokines. Therefore, higher levels of pro-inflammatory cytokines indicate unresolved inflammation in the cervix of the low-fertility Suffolk breed that could contribute to reduced cervical sperm transport in the next follicular phase.
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Affiliation(s)
- Laura Abril-Parreño
- Laboratory of Animal Reproduction, Department of Biological Sciences, School of Natural Sciences, Biomaterials Research Cluster, Bernal Institute, Faculty of Science and Engineering. University of Limerick, V94 T9PX, Limerick, Ireland
| | - Anette Kristine Krogenæs
- Department of Production Animal Clinical Sciences, Faculty of Veterinary Medicine, Norwegian University of Life Sciences, 5003 1432, Ås, Norway
| | - Xavier Druart
- UMR-PRC, INRA-85, Université de Tours, IFCE, Physiologie de la Reproduction et des Comportements, Institut National de la Recherche Agronomique, 37380, Nouzilly, France
| | - Paul Cormican
- Animal & Bioscience Research Department, Animal & Grassland Research and Innovation Centre, Teagasc, C15 PW93, Grange, Ireland
| | - Sean Fair
- Laboratory of Animal Reproduction, Department of Biological Sciences, School of Natural Sciences, Biomaterials Research Cluster, Bernal Institute, Faculty of Science and Engineering. University of Limerick, V94 T9PX, Limerick, Ireland
| | - Kieran G Meade
- School of Agriculture and Food Science, University College Dublin, Belfield, D04 W6F6, Dublin 4, Ireland
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Abril-Parreño L, Meade KG, Krogenæs AK, Druart X, Cormican P, Fair S. Ewe breed differences in the cervical transcriptome at the follicular phase of a synchronised oestrous cycle. BMC Genomics 2022; 23:363. [PMID: 35546662 PMCID: PMC9097332 DOI: 10.1186/s12864-022-08603-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2021] [Accepted: 04/26/2022] [Indexed: 12/13/2022] Open
Abstract
Background Cervical artificial insemination (AI) with frozen-thawed semen results in unacceptably low pregnancy rates internationally. The exception is in Norway, where vaginal deposition of frozen-thawed semen to a natural oestrous routinely yields pregnancy rates in excess of 70%. Previous studies by our group has demonstrated that this is due to differences in cervical sperm transport. However, a potentially important contributory factor is that ewes are inseminated to a natural oestrous in Norway but to a synchronised oestrous across most of the rest of the world. In this study, we interrogated the gene expression of the sheep cervix of four ewe breeds with known differences in pregnancy rates following cervical AI using frozen-thawed semen under the effect of exogenous hormones to synchronise the oestrous cycle. These four ewe breeds (n = 8 to 11 ewes per breed) are from two countries: Ireland (Belclare and Suffolk; medium and low fertility, respectively) and Norway (Norwegian White Sheep (NWS) and Fur; both with high fertility compared to the Irish ewe breeds). Results RNA extracted from cervical biopsies collected from these breeds was analysed by RNA-sequencing and differential gene expression analysis. Using the low-fertility Suffolk breed as a reference level; 27, 1827 and 2641 genes were differentially expressed in Belclare, Fur and NWS ewes, respectively (P < 0.05 and FC > 1.5). Gene ontology (GO) analysis revealed that Fur and NWS had an up-regulation of enriched pathways involved in muscle contraction and development compared to Suffolk. However, there was a down-regulation of the immune response pathway in NWS compared to Suffolk. In addition, GO analysis showed similar expression patterns involved in muscle contraction, extracellular matrix (ECM) development and cell-cell junction in both Norwegian ewe breeds, which differed to the Irish ewe breeds. Conclusions This novel study has identified a number of conserved and breed-specific biological processes under the effect of oestrous synchronisation that may impact cervical sperm transport during the follicular phase of the reproductive cycle. Supplementary Information The online version contains supplementary material available at 10.1186/s12864-022-08603-8.
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Affiliation(s)
- Laura Abril-Parreño
- Laboratory of Animal Reproduction, Department of Biological Sciences, School of Natural Sciences, Biomaterials Research Cluster, Bernal Institute, Faculty of Science and Engineering, University of Limerick, Limerick, Ireland
| | - Kieran G Meade
- School of Agriculture and Food Science, University College Dublin, Belfield, Dublin 4, Ireland
| | | | - Xavier Druart
- UMR 6175 INRA, CNRS-Université de Tours-Haras Nationaux, Station de Physiologie de la Reproduction et des Comportements Institut National de la Recherche Agronomique, Nouzilly, France
| | - Paul Cormican
- Animal & Bioscience Research Department, Animal & Grassland Research and Innovation Centre, Teagasc, Grange, Co, Meath, Ireland
| | - Sean Fair
- Laboratory of Animal Reproduction, Department of Biological Sciences, School of Natural Sciences, Biomaterials Research Cluster, Bernal Institute, Faculty of Science and Engineering, University of Limerick, Limerick, Ireland.
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Cryopreservation Techniques for Ram Sperm. Vet Med Int 2022; 2022:7378379. [PMID: 35535035 PMCID: PMC9078814 DOI: 10.1155/2022/7378379] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2022] [Accepted: 04/18/2022] [Indexed: 12/02/2022] Open
Abstract
Germplasm storage and transportation in artificial insemination (AI) and other advanced technologies are facilitated by cryopreservation. In reproduction, the cryopreservation of sperm allows it to be transported across vast distances and used even after the sire's death. However, the technique of cryopreservation might damage sperm and limit their activity. Several cryobiological investigations have reported that the integrity of the sperm membrane is frequently involved in the physical and biological elements that affect sperm survival at low temperatures during the cryopreservation process. However, successful cryopreservation of ram sperm is still a work in progress because a considerable percentage of sperm do not survive the freezing and thawing process. Sperms are destroyed during cryopreservation of semen due to varying concentrations of cryoprotective chemicals and if semen is not cooled at optimal cooling rates. Hence, it is crucial to know the optimum cooling rates with freezing and thawing protocols for maximum recovery of viable and functional sperm cells for a successful cryo-freezing of ram spermatozoa. Therefore, the current study compiled and compared the research on the impact of different cryopreservation procedures, cooling rates, equilibration time, and thawing protocols on post-thaw ram semen quality.
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Abril-Parreño L, Morgan J, Krogenæs A, Druart X, Cormican P, Gallagher ME, Reid C, Meade K, Saldova R, Fair S. Biochemical and molecular characterisation of sialylated cervical mucins in sheep. Biol Reprod 2022; 107:419-431. [PMID: 35470857 PMCID: PMC9382375 DOI: 10.1093/biolre/ioac077] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2021] [Revised: 01/19/2022] [Accepted: 04/20/2022] [Indexed: 11/13/2022] Open
Abstract
Sialic acid occupies terminal positions on O-glycans of cervical mucins, where they contribute to the increased viscosity of mucin thereby regulating sperm transport. This study characterised the sialylated cervical mucins from follicular phase mucus of six European ewe breeds with known differences in pregnancy rates following cervical artificial insemination using frozen-thawed semen at both synchronised and natural oestrus cycles. These were Suffolk (low fertility) and Belclare (medium fertility) in Ireland, Ile de France and Romanov (both with medium fertility) in France and Norwegian White Sheep (NWS) and Fur (both with high fertility) in Norway. Expression of mucin and sialic acid related genes was quantified using RNA-sequencing in cervical tissue from Suffolk, Belclare, Fur and NWS only. Cervical tissue was also assessed for the percentage of cervical epithelial populated by mucin secreting goblet cells in the same four ewe breeds. Biochemical analysis showed that there was an effect of ewe breed on sialic acid species, which was represented by Suffolk having higher levels of Neu5,9Ac2 compared to NWS (P < 0.05). Suffolk ewes had a lower percentage of goblet cells than Fur and NWS (P < 0.05). Gene expression analysis identified higher expression of MUC5AC, MUC5B, ST6GAL1, ST6GAL2 and lower expression of ST3GAL3, ST3GAL4 and SIGLEC10 in Suffolk compared to high fertility ewe breeds (P < 0.05). Our results indicate that specific alterations in sialylated mucin composition may be related to impaired cervical sperm transport.
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Affiliation(s)
- Laura Abril-Parreño
- Laboratory of Animal Reproduction, Department of Biological Sciences, School of Natural Sciences, Biomaterials Research Cluster, Bernal Institute, Faculty of Science and Engineering. University of Limerick, V94 T9PX, Limerick, Ireland.,Teagasc, Animal & Grassland Research and Innovation Centre, C15 PW93, Grange, Ireland
| | - Jack Morgan
- NIBRT GlycoScience Group, The National Institute for Bioprocessing Research and Training, A94 X099, Blackrock, Ireland
| | - Anette Krogenæs
- Department of Production Animal Clinical Sciences, Faculty of Veterinary Medicine, Norwegian University of Life Sciences, 5003 1432, Ås, Norway
| | - Xavier Druart
- UMR-PRC, INRA-85, Université de Tours, IFCE, Physiologie de la Reproduction et des Comportements, Institut National de la Recherche Agronomique, 37380, Nouzilly, France
| | - Paul Cormican
- Teagasc, Animal & Grassland Research and Innovation Centre, C15 PW93, Grange, Ireland
| | - Mary E Gallagher
- UCD Veterinary Sciences Centre, University College Dublin, D04 W6F6, Belfield, Ireland
| | - Colm Reid
- UCD Veterinary Sciences Centre, University College Dublin, D04 W6F6, Belfield, Ireland
| | - Kieran Meade
- School of Agriculture and Food Science, University College Dublin, Belfield, D04 W6F6, Dublin 4, Ireland
| | - Radka Saldova
- NIBRT GlycoScience Group, The National Institute for Bioprocessing Research and Training, A94 X099, Blackrock, Ireland.,UCD School of Medicine, College of Health and Agricultural Science, University College Dublin, D07 A8NN, Dublin 4, Ireland.,CÚRAM, SFI Research Centre for Medical Devices, National University of Ireland, H91 W2TY, Galway, Ireland
| | - Sean Fair
- Laboratory of Animal Reproduction, Department of Biological Sciences, School of Natural Sciences, Biomaterials Research Cluster, Bernal Institute, Faculty of Science and Engineering. University of Limerick, V94 T9PX, Limerick, Ireland
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Wu C, Dai J, Zhang S, Sun L, Liu Y, Zhang D. Effect of Thawing Rates and Antioxidants on Semen Cryopreservation in Hu Sheep. Biopreserv Biobank 2021; 19:204-209. [PMID: 33625896 DOI: 10.1089/bio.2020.0067] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Hu sheep is a valuable sheep breed in China, and semen cryopreservation of Hu sheep is important for sustainable development of the agri-food industry. This study aimed to evaluate the effect of thawing rate and antioxidants (procyanidins [PC] and mitoquinone [MitoQ]) on the quality and antioxidant enzyme activity of post-thaw sperm in Hu sheep. Our results showed that the highest sperm quality was obtained from the group thawed at 70°C for 5 seconds. Furthermore, addition of 150 nM MitoQ in the extender could enhance motility, integrity of the membrane and acrosome, and mitochondrial activity, whereas only sperm motility and membrane integrity were increased with 10 μg/mL of PC supplementation, compared with the control group. Meanwhile, both PC (10 μg/mL) and MitoQ (150 nM) supplementation increased the levels of superoxide dismutase and glutathione peroxidase and decreased the levels of reactive oxygen species and malondialdehyde. In conclusion, the optimal thawing protocol of semen cryopreservation in Hu sheep was 70°C for 5 seconds. MitoQ supplementation (150 mM) in the extender could improve sperm quality and reduce the level of oxidative stress in Hu sheep semen after cryopreservation. Further studies are needed to evaluate fertility of the post-thaw semen using MitoQ.
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Affiliation(s)
- Caifeng Wu
- Institute of Animal Science and Veterinary Medicine, Shanghai Academy of Agriculture Sciences, Shanghai, China.,Division of Animal Genetic Engineering, Shanghai Municipal Key Laboratory of Agri-genetics and Breeding, Shanghai, China
| | - Jianjun Dai
- Institute of Animal Science and Veterinary Medicine, Shanghai Academy of Agriculture Sciences, Shanghai, China.,Division of Animal Genetic Engineering, Shanghai Municipal Key Laboratory of Agri-genetics and Breeding, Shanghai, China
| | - Shushan Zhang
- Institute of Animal Science and Veterinary Medicine, Shanghai Academy of Agriculture Sciences, Shanghai, China.,Division of Animal Genetic Engineering, Shanghai Municipal Key Laboratory of Agri-genetics and Breeding, Shanghai, China
| | - Lingwei Sun
- Institute of Animal Science and Veterinary Medicine, Shanghai Academy of Agriculture Sciences, Shanghai, China.,Division of Animal Genetic Engineering, Shanghai Municipal Key Laboratory of Agri-genetics and Breeding, Shanghai, China
| | - Ying Liu
- Department of Animal, Dairy, Veterinary Sciences, Utah State University, Logan, Utah, USA
| | - Defu Zhang
- Institute of Animal Science and Veterinary Medicine, Shanghai Academy of Agriculture Sciences, Shanghai, China.,Division of Animal Genetic Engineering, Shanghai Municipal Key Laboratory of Agri-genetics and Breeding, Shanghai, China
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Purdy PH, Spiller SF, McGuire E, McGuire K, Koepke K, Lake S, Blackburn HD. Critical factors for non-surgical artificial insemination in sheep. Small Rumin Res 2020. [DOI: 10.1016/j.smallrumres.2020.106179] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Fair S, Meade KG, Reynaud K, Druart X, de Graaf SP. The biological mechanisms regulating sperm selection by the ovine cervix. Reproduction 2020; 158:R1-R13. [PMID: 30921769 DOI: 10.1530/rep-18-0595] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2018] [Accepted: 03/28/2019] [Indexed: 01/11/2023]
Abstract
In species where semen is deposited in the vagina, the cervix has the unique function of facilitating progress of spermatozoa towards the site of fertilisation while also preventing the ascending influx of pathogens from the vagina. For the majority of species, advances in assisted reproduction techniques facilitate the bypassing of the cervix and therefore its effect on the transit of processed spermatozoa has been largely overlooked. The exception is in sheep, as it is currently not possible to traverse the ovine cervix with an inseminating catheter due to its complex anatomy, and semen must be deposited at the external cervical os. This results in unacceptably low pregnancy rates when frozen-thawed or liquid stored (>24 h) semen is inseminated. The objective of this review is to discuss the biological mechanisms which regulate cervical sperm selection. We assess the effects of endogenous and exogenous hormones on cervical mucus composition and discuss how increased mucus production and flow during oestrus stimulates sperm rheotaxis along the crypts and folds of the cervix. Emerging results shedding light on the sperm-cervical mucus interaction as well as the dialogue between spermatozoa and the innate immune system are outlined. Finally, ewe breed differences in cervical function and the impact of semen processing on the success of fertilisation, as well as the most fruitful avenues of further investigation in this area are proposed.
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Affiliation(s)
- S Fair
- Laboratory of Animal Reproduction, School of Natural Sciences, Faculty of Science and Engineering, University of Limerick, Limerick, Ireland
| | - K G Meade
- Animal & Bioscience Research Department, Animal & Grassland Research and Innovation Centre, Teagasc, Grange, Co Meath, Ireland
| | - K Reynaud
- UMR PRC, INRA 85, CNRS 7247, Université de Tours, IFCE, Physiologie de la Reproduction et des Comportements, Institut National de la Recherche Agronomique, Nouzilly, France
| | - X Druart
- UMR PRC, INRA 85, CNRS 7247, Université de Tours, IFCE, Physiologie de la Reproduction et des Comportements, Institut National de la Recherche Agronomique, Nouzilly, France
| | - S P de Graaf
- The University of Sydney, School of Life and Environmental Sciences, Faculty of Science, Sydney, New South Wales, Australia
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Jha PK, Shahi Alam MG, Mansur AAL, Naher N, Islam T, Uddin Bhuiyan M, Bari FY. Cryopreservation of Bangladeshi ram semen using different diluents and manual freezing techniques. Cryobiology 2019; 89:35-41. [DOI: 10.1016/j.cryobiol.2019.06.001] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2019] [Revised: 06/02/2019] [Accepted: 06/03/2019] [Indexed: 10/26/2022]
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Comparative Study between Ovine Artificial Insemination and Free Mating in Ouled Djellal Breed. ACTA ACUST UNITED AC 2014. [DOI: 10.1016/j.apcbee.2014.03.036] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Mara L, Casu S, Carta A, Dattena M. Cryobanking of farm animal gametes and embryos as a means of conserving livestock genetics. Anim Reprod Sci 2013; 138:25-38. [PMID: 23477753 DOI: 10.1016/j.anireprosci.2013.02.006] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2012] [Revised: 11/30/2012] [Accepted: 02/09/2013] [Indexed: 01/12/2023]
Abstract
In the last few decades, farm animal genetic diversity has rapidly declined, mainly due to changing market demands and intensification of agriculture. But, since the removal of single species can affect the functioning of global ecosystems, it is in the interest of international community to conserve the livestock genetics and to maintain biodiversity. Increasing awareness on the reduction of breed diversity has prompted global efforts for conservation of farm animal breeds. The goals of conservation are to keep genetic variation as gene combinations in a reversible form and to keep specific genes of interest. For this purpose two types of strategies are usually proposed: in situ and ex situ conservation. In situ conservation is the breed maintaining within the livestock production system, in its environment through the enhancement of its production characteristics. Ex situ in vivo conservation is the safeguard of live animals in zoos, wildlife parks, experimental farms or other specialized centres. Ex situ in vitro conservation is the preservation of genetic material in haploid form (semen and oocytes), diploid (embryos) or DNA sequences. In the last few years, ex situ in vitro conservation programs of livestock genetic resources have focused interest on cryopreservation of gametes, embryos and somatic cells as well as testis and ovarian tissues, effectively lengthening the genetic lifespan of individuals in a breeding program even after the death. However, although significant progress has been made in semen, oocytes and embryo cryopreservation of several domestic species, a standardized procedure has not been established yet. The aim of the present review is to describe the cryobanking purposes, the collection goals, the type of genetic material to store and the reproductive biotechnologies utilized for the cryopreservation of farm animal gametes and embryos.
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Affiliation(s)
- L Mara
- Agris-Sardegna, DIRPA, Reproduction Division, S.S. 291 Km 18.6, 07100 Sassari, Italy.
| | - Sara Casu
- Agris-Sardegna, DIRPA, Genetic and biotechnology division, S.S. 291 Km 18.6, 07100 Sassari, Italy
| | - A Carta
- Agris-Sardegna, DIRIP, Production and Technology Division, Italy
| | - M Dattena
- Agris-Sardegna, DIRPA, Reproduction Division, S.S. 291 Km 18.6, 07100 Sassari, Italy
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Sheep breeding schemes utilising artificial insemination; large-scale simulation with a complex breeding goal. Animal 2012; 5:367-77. [PMID: 22445403 DOI: 10.1017/s1751731110002053] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
Abstract
Alternative Norwegian sheep breeding schemes were evaluated by stochastic simulation of a breeding population with about 120 000 ewes, considering the gain for an aggregate genotype including nine traits and also the rate of inbreeding. The schemes were: a scheme where both young unproven rams (test rams) and proven rams (elite rams) are used in artificial insemination (AI scheme), a scheme with test rams in natural mating in ram circles and elite rams (from one and a half years of age) in AI across all flocks in the country (NMAI2 scheme), a scheme where, in addition to testing rams, the youngest elite rams (one and a half years of age) are also used in natural mating in ram circles, while older elite rams are used in AI (NMAI1 scheme), and a scheme, acting as a control, where both test and elite rams are used in natural mating (NM scheme). Within the NMAI- and AI-schemes, experimentation was performed for percent ewes inseminated to elite rams v. test rams (EM%), numbers of ewes inseminated per elite ram (EAIn), and numbers of ewes mated per test ram by natural service (TNMn) or by AI (TAIn), respectively. With a restriction on the rate of inbreeding (⩽0.8% per generation), the AI scheme gave similar gain to the NMAI2 scheme (and about 40% more than did the NM scheme). Less gain was generated by the NMAI1 scheme, but it was still considerably more than for the NM scheme (about 25%). In the AI scheme, relatively few ewes (200/300) should be inseminated to each test/elite ram, and a low EM% should be chosen (10%). In the NMAI schemes, TNMn should be relatively high (40 to 50), combined with average and somewhat larger than average EAIn (NMAI2: 700 ewes, NMAI1: 900 ewes), and EM% medium (30%).
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15
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Natural, but not lyophilized, low density lypoproteins were an acceptable alternative to egg yolk for cryopreservation of ram semen. Theriogenology 2011; 75:300-7. [DOI: 10.1016/j.theriogenology.2010.08.016] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2010] [Revised: 08/24/2010] [Accepted: 08/25/2010] [Indexed: 11/23/2022]
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16
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Vaginal deposition of frozen-thawed semen in Norwegian Dairy goats: Comparison of single and double insemination with equal total number of spermatozoa. Theriogenology 2010; 74:895-900. [DOI: 10.1016/j.theriogenology.2010.04.014] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2010] [Revised: 04/09/2010] [Accepted: 04/11/2010] [Indexed: 11/22/2022]
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17
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FUKUI Y, KOHNO H, OKABE K, KATSUKI S, YOSHIZAWA M, TOGARI T, WATANABE H. Factors Affecting the Fertility of Ewes after Intrauterine Insemination with Frozen-Thawed Semen During the Non-Breeding Season. J Reprod Dev 2010; 56:460-6. [DOI: 10.1262/jrd.10-015t] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Affiliation(s)
- Yutaka FUKUI
- Laboratory of Animal Reproduction, Obihiro University of Agriculture and Veterinary Medicine
| | | | | | - Sara KATSUKI
- Laboratory of Animal Reproduction, Obihiro University of Agriculture and Veterinary Medicine
| | - Masahiro YOSHIZAWA
- Laboratory of Animal Reproduction, Obihiro University of Agriculture and Veterinary Medicine
| | | | - Hiroyuki WATANABE
- Laboratory of Animal Reproduction, Obihiro University of Agriculture and Veterinary Medicine
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18
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Paulenz H, Ådnøy T, Fossen OH, Söderquist L. Effect on Field Fertility of Addition of Gelatine, Different Dilution Rates and Storage Times of Cooled Ram Semen After Vaginal Insemination. Reprod Domest Anim 2009; 45:706-10. [DOI: 10.1111/j.1439-0531.2008.01338.x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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