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Garza-Brenner E, Sánchez-Dávila F, Mauleón-Tolentino K, Zapata-Campos CC, Luna-Palomera C, Hernandez-Melendez J, Gonzalez-Delgado M, Vázquez-Armijo JF. Systematic review of hormonal strategies to improve fertility in rams. Anim Reprod 2024; 21:e20240007. [PMID: 38903866 PMCID: PMC11189135 DOI: 10.1590/1984-3143-ar2024-0007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2024] [Accepted: 04/16/2024] [Indexed: 06/22/2024] Open
Abstract
Reviewing the current state of knowledge on reproductive performance and productive traits in rams has many advantages. First, the compilation of this information will serve as a literature resource for scientists conducting research around the world and will contribute to the understanding of the data collected and interpreted by researchers on the different hormonal strategies used to improve reproductive performance in rams. Second, it will allow scientists to identify current knowledge gaps and set future research priorities in ram reproduction. Rams play an important role in the global flock economy, but their reproductive analysis has been limited in the use of hormonal technologies to increase the productivity of sheep flocks. In this review, we cite the most important works on six hormones that, in one way or another, modify the hypothalamus-pituitary-gonadal axis, at different doses, in and out of the reproductive season, breeds, application methods, among other factors. The overall aim is to increase the reproductive efficiency of rams in different scenarios and, in some cases, of other species due to the lack of limited information on rams.
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Affiliation(s)
- Estela Garza-Brenner
- Facultad de Agronomía, Posgrado Conjunto, Universidad Autónoma de Nuevo León, General Escobedo, N.L México
| | - Fernando Sánchez-Dávila
- Facultad de Agronomía, Posgrado Conjunto, Universidad Autónoma de Nuevo León, General Escobedo, N.L México
| | - Keyla Mauleón-Tolentino
- Facultad de Agronomía, Posgrado Conjunto, Universidad Autónoma de Nuevo León, General Escobedo, N.L México
| | - Cecilia Carmela Zapata-Campos
- Facultad de Medicina Veterinaria y Zootecnia, Universidad Autónoma de Tamaulipas, Ciudad Victoria, Tamaulipas, México
| | - Carlos Luna-Palomera
- División Académica de Ciencias Agropecuarias, Universidad Juárez Autónoma de Tabasco, Villahermosa, Tabasco, México
| | | | - Marisol Gonzalez-Delgado
- Centro de Investigación en Producción Agropecuaria, Universidad Autónoma de Nuevo León, Linares, Nuevo León, México
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Peña-Delgado V, Noya A, Carvajal-Serna M, Abecia JA, Pérez-Pe R, Casao A. Differential effect of melatonin on ram spermatozoa depending on the allelic variant of the RsaI polymorphism of the MTR1A gene, incubation medium and season. Reprod Fertil Dev 2024; 36:NULL. [PMID: 38905444 DOI: 10.1071/rd23233] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2023] [Accepted: 06/03/2024] [Indexed: 06/23/2024] Open
Abstract
Context The Rsa I polymorphism of the melatonin receptor MTNR1A gene affects seasonal reproduction in sheep, but its effect on ram spermatozoa and their response to melatonin is unknown. Aims This study aims to evaluate whether Rsa I polymorphism of the MTNR1A gene influences the response of ram spermatozoa to in vitro added melatonin. Methods Spermatozoa from rams carrying different Rsa I allelic variants were incubated with melatonin in a TALP medium or a capacitation-triggering medium during the reproductive and non-reproductive seasons. After incubation, sperm motility, membrane integrity, mitochondria activity, oxidative damage, apoptotic markers and capacitation status were assessed. Key results In the reproductive season, the T/T genotype was related to some adverse effects of melatonin when spermatozoa were incubated in TALP medium, whereas the C/C genotype was linked with adverse effects when the hormone was added in a capacitation-triggering medium. The decapacitating effect of melatonin on spermatozoa was also different depending on genotype. Conclusions The melatonin effect on spermatozoa from rams carrying different Rsa I genotypes differed depending on the season and the medium. Implications The knowledge of the Rsa I allelic variant of the MTNR1A gene of rams could be helpful when carrying out in vitro reproductive techniques in the ovine species.
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Affiliation(s)
- Victoria Peña-Delgado
- BIOFITER-IUCA, Universidad de Zaragoza, Facultad de Veterinaria, Miguel Servet 177, 50013 Zaragoza, Spain
| | - Agustí Noya
- BIOFITER-IUCA, Universidad de Zaragoza, Facultad de Veterinaria, Miguel Servet 177, 50013 Zaragoza, Spain
| | - Melissa Carvajal-Serna
- BIOFITER-IUCA, Universidad de Zaragoza, Facultad de Veterinaria, Miguel Servet 177, 50013 Zaragoza, Spain
| | - José A Abecia
- BIOFITER-IUCA, Universidad de Zaragoza, Facultad de Veterinaria, Miguel Servet 177, 50013 Zaragoza, Spain
| | - Rosaura Pérez-Pe
- BIOFITER-IUCA, Universidad de Zaragoza, Facultad de Veterinaria, Miguel Servet 177, 50013 Zaragoza, Spain
| | - Adriana Casao
- BIOFITER-IUCA, Universidad de Zaragoza, Facultad de Veterinaria, Miguel Servet 177, 50013 Zaragoza, Spain
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Peña-Delgado V, Noya A, Carvajal-Serna M, Canto F, Sánchez MC, Letosa E, Vicente A, Morato I, Macías Á, Abecia JA, Casao A, Pérez-Pe R. Genotyping of rams based on melatonin receptor 1A gene polymorphisms: a tool in sire selection? Reprod Fertil Dev 2024; 36:RD23235. [PMID: 38753960 DOI: 10.1071/rd23235] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2023] [Accepted: 04/23/2024] [Indexed: 05/18/2024] Open
Abstract
Context Several polymorphisms in the melatonin receptor 1A gene (MTNR1A ) have been related to reproductive performance in ovine. Aims To investigate the effect of the Rsa I and Mnl I polymorphisms on ram seminal quality. Methods Eighteen Rasa Aragonesa rams were genotyped for the Rsa I (C/C, C/T, T/T) and Mnl I (G/G, G/A, A/A) allelic variants of the MTNR1A gene. Individual ejaculates were analysed once a month throughout the whole year. Sperm motility, morphology, membrane integrity, levels of reactive oxygen species (ROS), phosphatidylserine (PS) inversion, DNA fragmentation and capacitation status were assessed. The effect of the season and polymorphisms on seminal quality was evaluated by mixed ANOVA. Key results Both polymorphisms had an effect on membrane integrity and viable spermatozoa with low levels of ROS and without PS translocation, and Rsa I also on motile and DNA-intact spermatozoa. An interaction between both polymorphisms was found, pointing to a negative effect on seminal quality of carrying the T or A allele in homozygosity. Differences were higher in the reproductive than in the non-reproductive season. Conclusions Mutations substituting C by T and G by A at Rsa I and Mnl I polymorphic sites, respectively, in the MTNR1A gene in rams could decrease the seminal quality. Implications Genotyping of rams based on melatonin receptor 1A could be a powerful tool in sire selection.
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Affiliation(s)
- Victoria Peña-Delgado
- Grupo BIOFITER-IUCA, Universidad de Zaragoza, Facultad de Veterinaria, Miguel Servet 177, 50013 Zaragoza, Spain
| | - Agustí Noya
- Grupo BIOFITER-IUCA, Universidad de Zaragoza, Facultad de Veterinaria, Miguel Servet 177, 50013 Zaragoza, Spain
| | - Melissa Carvajal-Serna
- Grupo BIOFITER-IUCA, Universidad de Zaragoza, Facultad de Veterinaria, Miguel Servet 177, 50013 Zaragoza, Spain
| | - Francisco Canto
- Grupo BIOFITER-IUCA, Universidad de Zaragoza, Facultad de Veterinaria, Miguel Servet 177, 50013 Zaragoza, Spain
| | - María Carmen Sánchez
- Centro de Selección y Reproducción Animal, Centro de Transferencia Agroalimentaria de Aragón, Barrio de Movera, 580, 50194 Zaragoza, Spain
| | - Eva Letosa
- Centro de Selección y Reproducción Animal, Centro de Transferencia Agroalimentaria de Aragón, Barrio de Movera, 580, 50194 Zaragoza, Spain
| | - Antonio Vicente
- Centro de Selección y Reproducción Animal, Centro de Transferencia Agroalimentaria de Aragón, Barrio de Movera, 580, 50194 Zaragoza, Spain
| | - Ignacio Morato
- Centro de Selección y Reproducción Animal, Centro de Transferencia Agroalimentaria de Aragón, Barrio de Movera, 580, 50194 Zaragoza, Spain
| | - Ángel Macías
- Asociación Nacional de Criadores de Rasa Aragonesa (ANGRA), Cabañera Real, s/n, 50800 Zuera, Spain
| | - José Alfonso Abecia
- Grupo BIOFITER-IUCA, Universidad de Zaragoza, Facultad de Veterinaria, Miguel Servet 177, 50013 Zaragoza, Spain
| | - Adriana Casao
- Grupo BIOFITER-IUCA, Universidad de Zaragoza, Facultad de Veterinaria, Miguel Servet 177, 50013 Zaragoza, Spain
| | - Rosaura Pérez-Pe
- Grupo BIOFITER-IUCA, Universidad de Zaragoza, Facultad de Veterinaria, Miguel Servet 177, 50013 Zaragoza, Spain
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Abuzahra M, Wijayanti D, Effendi MH, Mustofa I, Lamid M. Association of melatonin receptor 1 A with litter size in sheep: A review. F1000Res 2024; 12:900. [PMID: 38322310 PMCID: PMC10844802 DOI: 10.12688/f1000research.134890.2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 01/04/2024] [Indexed: 02/08/2024] Open
Abstract
Sheep are a valuable livestock species worldwide, providing meat, milk, and various dairy products. This article aims to review the latest literature on the melatonin receptor 1A (MTNR1A) gene as a potential candidate gene associated with reproductive traits, particularly the litter size trait in sheep, by searching various databases for available literature. Studies have shown that different parts of the MTNR1A gene play various roles in sheep. By identifying marker genes associated with reproductive traits in MTNR1A polymorphisms linked to the litter size trait, breeders can achieve a faster selection response in sheep breeding by recognizing the genomic region where these genes are located and understanding their physiological functions. Therefore, highlighting the literature on these functions and their association with reproductive traits may contribute to improving the genetic makeup during sheep breeding.
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Affiliation(s)
| | - Dwi Wijayanti
- Department of Animal Science, Perjuangan University of Tasikmalaya, Tasikmalaya, West Java, 46115, Indonesia
- College of Animal Science and Technology, Northwest A&F University, Yangling, Shaanxi, 712100, China
| | - Mustofa Helmi Effendi
- Department of Veterinary Public Health, Faculty of Veterinary Medicine, Universitas Airlangga, Surabaya, Indonesia
| | - Imam Mustofa
- Department of Veterinary Reproduction, Faculty of Veterinary Medicine, Universitas Airlangga, Surabaya, Indonesia
| | - Mirni Lamid
- Department of Animal Husbandry, Universitas Airlangga, Surabaya, East Java, Indonesia
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Yang D, Yuan L, Chen G, Chen S, Ma X, Xing Y, Song J. Expression and role of melatonin membrane receptors in the hypothalamic-pituitary-testicular axis of Tibetan sheep in a plateau pastoral area. PLoS One 2023; 18:e0290775. [PMID: 37878614 PMCID: PMC10599587 DOI: 10.1371/journal.pone.0290775] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2023] [Accepted: 08/16/2023] [Indexed: 10/27/2023] Open
Abstract
MTNR1A and MTNR1B, two high-affinity MT membrane receptors found in mammals, mediate the activity of MT on the HPGA to regulate animal reproduction. Nevertheless, the expression patterns and function of the MTNR1A and MTNR1B genes in the HPTA of seasonal estrus sheep and perennial estrus sheep have not been elucidated. We studied the expression of MTNR1A and MTNR1B in the hypothalamic-pituitary-testicular axis (HPTA) of Tibetan sheep at different reproductive stages using histochemistry, enzyme linked immunosorbent assay (ELSIA), scanning electron microscopy, transmission electron microscopy, quantitative Real-time PCR (qRT-PCR), and Western blot (WB), and analyzed the relationship between their expression and reproductive hormone receptors. We also compared relevant characteristics between seasonal Tibetan sheep and non-seasonal Small Tail Han sheep in the same pastoral area. The results showed that MTNR1A and MTNR1B were expressed in all tissues of the Tibetan sheep HPTA, and both were co-expressed in the cytoplasm of epididymis basal and halo cells located at common sites of the epididymis basement membrane, forming an immune barrier. The qRT-PCR analysis showed that not only MTNR1A but also N-acetyltransferase (AANAT), hydroxyindole-oxygen- methyltransferase (HIOMT), androgen receptor (AR), and estrogen receptor α (ERα) mRNA expression was significantly upregulated in the testis and epididymis of Tibetan sheep during the breeding season, whereas no clear upregulation of these genes was observed in the tissues of Small Tail Han sheep. MTNR1A and MTNR1B are important regulators of the HPTA in sheep. MTNR1A mediates seasonal estrus regulation in Tibetan sheep. Both MTNR1A and MTNR1B may play important roles in formation of the blood-epididymal barrier. The results of this study should help advance research on the mechanism of reproductive regulation of the HPTA in male animals and provide reference data for improving the reproductive rate of seasonal breeding animals.
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Affiliation(s)
- Dapeng Yang
- College of Veterinary Medicine, Gansu Agricultural University, Lanzhou, China
| | - Ligang Yuan
- College of Veterinary Medicine, Gansu Agricultural University, Lanzhou, China
- Gansu Key Laboratory of Animal Generational Physiology and Reproductive Regulation, Lanzhou, China
| | - Guojuan Chen
- Huangzhong District Animal Disease Control Center of Xining City, Xining City, Qinghai Province, China
| | - Shaoyu Chen
- College of Veterinary Medicine, Gansu Agricultural University, Lanzhou, China
| | - Xiaojie Ma
- College of Veterinary Medicine, Gansu Agricultural University, Lanzhou, China
| | - Yindi Xing
- College of Veterinary Medicine, Gansu Agricultural University, Lanzhou, China
| | - Juanjuan Song
- College of Veterinary Medicine, Gansu Agricultural University, Lanzhou, China
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He X, Wang W, Sun W, Chu M. Photoperiod Induces DNA Methylation Changes in the Melatonin Receptor 1A Gene in Ewes. Animals (Basel) 2023; 13:1917. [PMID: 37370427 DOI: 10.3390/ani13121917] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2023] [Revised: 06/03/2023] [Accepted: 06/05/2023] [Indexed: 06/29/2023] Open
Abstract
Research has shown that MTNR1A plays an essential role in the estrus cycle and seasonal reproduction changes in sheep. However, few people have focused on the DNA methylation of MTNR1A by season or photoperiod. In this study, using qPCR and Western blotting, we measured the MTNR1A expression in the hypothalamus of ovariectomized and estradiol-treated (OVX + E2) sheep under different photoperiod treatment conditions. Subsequently, the core promoter of the MTNR1A gene was identified, and its methylation level in sheep exposed to different photoperiod treatments was measured by pyrosequencing. The results showed that MTNR1A gene expression significantly differed between the short 42-day photoperiod (SP42) and the LP42 or combined SP-LP42 treatment groups (p < 0.05). In addition, we determined that the core MTNR1A promoter region was within 540 bp upstream of the transcriptional start site (TSS) and that the DNA methylation levels at CpG sites in the SP42 vs. LP42 and SP42 vs. SP-LP42 groups significantly differed. Finally, a significant negative correlation (p < 0.001) between gene expression and DNA methylation levels was revealed, suggesting that photoperiod may induce DNA methylation of the MTNR1A gene and thus change its expression. The findings provide valuable bases for the further study of seasonal reproduction in sheep.
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Affiliation(s)
- Xiaoyun He
- Key Laboratory of Animal Genetics and Breeding and Reproduction of Ministry of Agriculture and Rural Affairs, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing 100193, China
| | - Wei Wang
- Key Laboratory of Animal Genetics and Breeding and Reproduction of Ministry of Agriculture and Rural Affairs, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing 100193, China
| | - Wei Sun
- College of Animal Science and Technology, Yangzhou University, Yangzhou 225009, China
- Joint International Research Laboratory of Agriculture and Agri-Product Safety of Ministry of Education of China, Yangzhou University, Yangzhou 225009, China
| | - Mingxing Chu
- Key Laboratory of Animal Genetics and Breeding and Reproduction of Ministry of Agriculture and Rural Affairs, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing 100193, China
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Lakhssassi K, Sarto MP, Marín B, Lahoz B, Folch J, Alabart JL, Serrano M, Calvo JH. Exploring differentially expressed genes in hypothalamic, pars tuberalis and pineal gland transcriptomes in different sexual behavior phenotypes in rams using RNA-Seq. J Anim Sci 2023; 101:skac365. [PMID: 36331073 PMCID: PMC9833037 DOI: 10.1093/jas/skac365] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2022] [Accepted: 11/02/2022] [Indexed: 11/06/2022] Open
Abstract
Reproductive seasonality is a limiting factor in sheep production. Sexual behavior is a key element in reproductive efficiency, and this function is regulated by the hypothalamus-pituitary-gonadal (HPG) axis. To understand the mechanisms of sexual behavior, transcriptomic sequencing technology was used to identify differentially expressed genes (DEGs) in the hypothalamus (HT), pars tuberalis (PT) and pineal gland (PG) in Rasa Aragonesa rams with different sexual behavior. Bioinformatics analysis of the 16,401 identified genes by RNA-Seq revealed 103 and 12 DEGs in the HT and the PG, respectively, at a false discovery rate (FDR) of 5% with an absolute value of expression ≥ 1 (log2FC). However, no DEGs were found in the PT. Functional annotation and pathway enrichment analysis showed that DEGs of HT were enriched mainly in neuroactive ligand-receptor interactions and signaling pathways, including notable candidate genes such as MTNR1A, CHRNA2, FSHB, LHB, GNRHR, AVP, PRL, PDYN, CGA, GABRD, and TSHB, which play a crucial role in sexual behavior. The GnRH and cAMP signaling pathways were also highlighted. In addition, gene set enrichment analysis (GSEA) identified potential pathways, dominated mainly by biological process category, that could be responsible for the differences in sexual behavior observed in rams. The intracellular protein transport and pattern specification process were enriched within the PT and the transcription factor binding and protein ubiquitination pathways for the PG. Thus, these pathways together may play an important role in the regulation of the sexual behavior in Rasa Aragonesa rams through the hypothalamic-pituitary-gonadal axis. The validation of 5 DEGs using reverse transcription quantitative polymerase chain reaction (RT-qPCR) showed expression patterns like the found with RNA-Seq. Overall, these results contribute to understanding the genomic basis of sexual behavior in rams. Our study demonstrates that multiple networks and pathways orchestrate sexual behavior in sheep.
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Affiliation(s)
- Kenza Lakhssassi
- Agrifood Research and Technology Centre of Aragon-IA2, 50059 Zaragoza, Spain
- INRA Instituts, 6356 Rabat, Morocco
| | - María Pilar Sarto
- Agrifood Research and Technology Centre of Aragon-IA2, 50059 Zaragoza, Spain
| | - Belén Marín
- Centre for Encephalopathies and Emerging Transmissible Diseases, Faculty of Veterinary Medicine, University of Zaragoza, 50018 Zaragoza, Spain
| | - Belén Lahoz
- Agrifood Research and Technology Centre of Aragon-IA2, 50059 Zaragoza, Spain
| | - José Folch
- Agrifood Research and Technology Centre of Aragon-IA2, 50059 Zaragoza, Spain
| | - José Luis Alabart
- Agrifood Research and Technology Centre of Aragon-IA2, 50059 Zaragoza, Spain
| | - Malena Serrano
- Department of Animal Breeding and Genetics, INIA-CSIC, 28040 Madrid, Spain
| | - Jorge Hugo Calvo
- Agrifood Research and Technology Centre of Aragon-IA2, 50059 Zaragoza, Spain
- ARAID, 50018 Zaragoza, Spain
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Merchán M, Coveñas R, Plaza I, Abecia JA, Palacios C. Anatomy of hypothalamic and diencephalic nuclei involved in seasonal fertility regulation in ewes. Front Vet Sci 2023; 10:1101024. [PMID: 36876003 PMCID: PMC9978410 DOI: 10.3389/fvets.2023.1101024] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2022] [Accepted: 01/31/2023] [Indexed: 02/18/2023] Open
Abstract
In this study, we describe in detail the anatomy of nuclei involved in seasonal fertility regulation (SFR) in ewes. For this purpose, the intergeniculate leaflet of the visual thalamus, the caudal hypothalamic arcuate nucleus, and suprachiasmatic, paraventricular and supraoptic nuclei of the rostral hypothalamus were morphometrically and qualitatively analyzed in Nissl-stained serial sections, in the three anatomical planes. In addition, data were collected on calcium-binding proteins and cell phenotypes after immunostaining alternate serial sections for calretinin, parvalbumin and calbindin. For a complete neuroanatomical study, glial architecture was assessed by immunostaining and analyzing alternate sections for glial fibrillary acidic protein (GFAP) and ionized calcium-binding adapter molecule 1 (IBA1). The results showed a strong microglial and astroglia reaction around the hypothalamic nuclei of interest and around the whole 3rd ventricle of the ewe brain. Moreover, we correlated cytoarchitectonic coordinates of panoramic serial sections with their macroscopic localization and extension in midline sagittal-sectioned whole brain to provide guidelines for microdissecting nuclei involved in SFR.
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Affiliation(s)
- Miguel Merchán
- Animal Production Area, Department of Construction and Agronomy, Faculty of Agricultural and Environmental Sciences, University of Salamanca, Salamanca, Spain.,Laboratory of Neuroanatomy of the Peptidergic Systems, Institute for Neuroscience of Castilla y León (INCYL), University of Salamanca, Salamanca, Spain.,Recognized Research Group - Molecular Bases of Development (Grupo de Investigación Reconocido - Bases Moleculares del Desarrollo - GIR-BMD), University of Salamanca, Salamanca, Spain
| | - Rafael Coveñas
- Laboratory of Neuroanatomy of the Peptidergic Systems, Institute for Neuroscience of Castilla y León (INCYL), University of Salamanca, Salamanca, Spain.,Recognized Research Group - Molecular Bases of Development (Grupo de Investigación Reconocido - Bases Moleculares del Desarrollo - GIR-BMD), University of Salamanca, Salamanca, Spain
| | - Ignacio Plaza
- Auditory Neuroplasticity Laboratory, Institute for Neuroscience of Castilla y León (INCYL), University of Salamanca, Salamanca, Spain
| | - José Alfonso Abecia
- Environmental Science Institute (IUCA), University of Zaragoza, Zaragoza, Spain
| | - Carlos Palacios
- Animal Production Area, Department of Construction and Agronomy, Faculty of Agricultural and Environmental Sciences, University of Salamanca, Salamanca, Spain
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