Дисертації з теми "Bovidae Embryos"
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Wooldridge, Lydia Katherine. "Supplementing Bovine Embryo Culture Media to Improve the Production and Quality of In Vitro Produced Bovine Embryos." Diss., Virginia Tech, 2020. http://hdl.handle.net/10919/105143.
Повний текст джерелаDoctor of Philosophy
Bovine embryos have been produced in vitro for the purpose of being transferred to recipient cattle to produce a calf since the 1980s. This practice allows cattle breeders to increase the number of offspring from their best females each year, and also allows for more rapid progress in generational genetic improvement. However, only approximately 10% of bovine oocytes survive and produce a calf. This poor efficiency of bovine in vitro embryo production negatively impacts the procedure's widespread use. A significant portion of these embryo losses are likely a result of inadequate in vitro culture conditions, particularly of the embryo culture media, the fluid in which embryos are grown. This media is often called "synthetic oviduct fluid," or SOF, because it is designed to mimic the fluid present in the cow's oviduct, where the embryo would normally reside. However, SOF is much simpler in nature than actual cow oviduct fluid, and this leads to reduced embryonic survival of in vitro produced embryos. Unfortunately, we know very little of what molecules control and promote bovine embryo development. Therefore, one major goal of bovine embryo research is to identify these factors and add them to SOF. The goal of this work was to examine the ability of three molecules, interleukin-6 (IL6), leukemia inhibitory factor (LIF), and zinc sulfate, to increase the number and quality of blastocysts produced through in vitro culture techniques. Additionally, I tested the replacement of SOF with a complex cell culture media, known as TeSR. This medium is more complex than SOF, and therefore should better promote embryo development. This work revealed that IL6, but not LIF, improves in vitro produced (IVP) bovine blastocyst quality. Unfortunately, neither IL6 nor LIF affected the percentage of embryos which survived to the blastocyst stage. However, IL6, but not LIF, increased the number of cells in the inner cell mass (ICM) of the blastocysts. ICM cells are the portion of the embryo which will produce the future calf. IVP bovine embryos are known to have fewer cells than normal, in vivo derived, blastocysts, and this issue is believed to cause some embryonic death after embryo transfer. Therefore, treatment with IL6 may increase the percentage of embryos which will survive after transfer and produce a calf. We also found the addition of zinc sulfate to SOF to benefit embryo quality. None of the concentrations of zinc significantly improved the percentage of embryos which survived to the blastocyst stage, but 2 µM zinc did increase ICM cell number. Like IL6, this may improve embryo survival after transfer. The use of the TeSR media as a replacement for SOF had some benefits. Unfortunately, this media is unusable for producing embryos for transfer to recipients, as we discovered early embryos could not survive in the media. However, blastocyst-stage embryos thrived in it, and could be cultured in vitro for a longer period of time as a result. Therefore, this media will be a useful tool for studying bovine embryo development in vitro, however it is unlikely to benefit calf production. In summary, this work provides evidence that zinc sulfate and IL6 are beneficial additions to SOF. However, future work is needed to determine if embryos produced with these factors are more able to produce a calf. Additionally, we discovered that TeSR is a superior extended blastocyst culture medium.
Simmet, Kilian Manuel Verfasser], and Eckhard [Akademischer Betreuer] [Wolf. "Chimeric bovine embryo multiplication with OCT4 knockout host embryos / Kilian Manuel Simmet ; Betreuer: Eckhard Wolf." München : Universitätsbibliothek der Ludwig-Maximilians-Universität, 2017. http://d-nb.info/1155407822/34.
Повний текст джерелаJooste, Frans. "The association between foot-and-mouth disease virus and bovine oocytes and embryos during in vitro embryo production." Diss., University of Pretoria, 2005. http://upetd.up.ac.za/thesis/available/etd-03022006-120630/.
Повний текст джерелаJousan, Frank Dean. "Effects of Differences in Dietary Protein and Varying the Interval from Collection of Bovine Embryos to Freezing on Embryo Quality and Viability." Thesis, Virginia Tech, 2002. http://hdl.handle.net/10919/33788.
Повний текст джерелаMaster of Science
Ben, Amor Hanene. "Chromosome abnormalities in preimplantation bovine embryos." Thesis, McGill University, 2004. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=111790.
Повний текст джерелаStudies suggest that chromosomal abnormalities notably mosaicism consisting of normal and abnormal cells is a common feature observed in mammalian preimplantation embryos. The data on chromosome abnormalities in bovine embryos however, are limited. The principal aim of this study was to investigate chromosome abnormalities and their effect on the development of bovine embryos produced in vitro. 193 embryos were evaluated for chromosomal abnormalities, using dual fluorescent in situ hybridization (FISH) with developed DNA probes for X and Y chromosomes. Our results demonstrate that uniformly abnormal embryos were found mostly at the early cleavage stages, and embryos with extensive chromosome abnormalities were usually arrested by the morula stage. Chromosomal mosaicism was observed at the 2- cell stage and increased steadily with subsequent stages of development. By the blastocyst stage, chromosomal mosaicism was the main abnormality observed and affected 95% of the blastocysts. Most of the mosaic blastocysts comprised of diploid and tetraploid cells. In the second part, a detailed analysis of 121 day 7 and days 9-10 blastocysts, demonstrated that the proportion of polyploid cells in most of the morphologically good quality embryos was less than 15%, which was significantly lower than in poor quality embryos. [...]
II a ete suggere que des anomalies chromosomiques particulierement le mosaicism sont frequemment rencontres chez les embryons des bovins produit in vitro, cependant les donnees disponibles sont tres limitees. Le but principal de cette etude est d'evaluer les anomalies chromosomiques particulierement le mosaicism au different stades de developpement embryonnaire par FISH en utilisant des probes 'ADN pour les chromosomes X et Y. Nos resultats demontrent que des embryons uniformement anormales ont ete surtout trouves aux premiers stades de cleavage, temoignant que les embryons avec une vaste anomalie affectant la totalite des embryons sont souvent arretes au stade du morula. Le mosaicism chromosomique a ete rencontre dans tous les stades de developpement et il a augmente emarquablement pendant le developpement embryonnaire. Ainsi, au stade du blastocyst, le mosaicism chromosomique etait l'anomalie principale observee avec 95 % de blastocysts analyses devenant mosaiques. [...]
Annes, Kelly. "Caracterização do metabolismo de lipídeos no desenvolvimento inicial de embriões bovinos produzidos in vitro com diferentes cinéticas de desenvolvimento." reponame:Repositório Institucional da UFABC, 2015.
Знайти повний текст джерелаDissertação (mestrado) - Universidade Federal do ABC, Programa de Pós-Graduação em Biotecnociência, 2015.
A morfologia e as taxas de clivagem e de blastocistos têm sido critérios utilizados para avaliação da competência embrionária. Entretanto, com o advento de novas biotecnologias tem-se tornado claro que a competência embrionária pode ser severamente comprometida sem alterações morfológicas perceptíveis. Estudos em embriões humanos propuseram avaliações morfológicas adicionais relacionadas ao momento das primeiras divisões celulares embrionárias (rápida e lenta) que parecem estar relacionadas com a viabilidade do embrião. No entanto, ainda não existem muitos dados dessa análise morfocinética em bovinos. A viabilidade embrionária também pode ser severamente comprometida pelo acúmulo de lipídeos nos embriões PIV, podendo inclusive prejudicar aplicações comerciais como a criopreservação. Com isso, o objetivo desse estudo foi caracterizar em embriões bovinos de cinéticas diferentes de desenvolvimento (rápido e lento) o padrão de metabolismo lipídico. Para tal, embriões produzidos in vitro foram analisados quanto a quantidade de lipídeos totais e caracterização de lipídeos de membrana nos estádios iniciais de clivagem (22hpi e 96hpi) e blastocisto. Para o estádio de blastocisto também foi incluído um grupo de embriões in vivo. Foi possível evidenciar menor quantidade de lipídeos totais pela coloração SUDAN BLACK B nos grupos lentos. As análises de MALDI-MS evidenciaram lipídeos de membrana com padrões distintos nos grupos rápidos e lentos nos estádios de clivagem e mórula. Já nos estádios de blastocistos os dados nos permitem inferir que o grupo de blastocisto lento parece estar mais próximo do grupo in vivo, pela semelhança na abundância/intensidade relativa no maior número de íons revelados pelas análises multivariadas. No entanto, o grupo lento ainda mostra alguma semelhança com o grupo rápido devido a exposição ao mesmo ambiente in vitro.
Embryo viability and competence have been evaluated by criteria such as morphology and cleavage and blastocyst rates. However, the advent and application of new biotechnologies have demonstrated that embryonic competence can be severely compromised without noticeable morphological changes. Human embryo studies proposed the use of additional morphological evaluations related to the moment of the first embryonic cell divisions and its kinetic (fast and slow), which appear to be relevant to the embryo viability. Nevertheless, there are still not enough data available related to the morphokinetic analysis of embryos in bovine cattle. Embryo viability can also be severely compromised by lipid accumulation in IVP (in vitro produced) embryos and can even harm commercial applications such as cryopreservation. Therefore, the aim of this study was to evaluate and characterize the pattern of lipid metabolism on bovine embryos with different developmental kinetics (fast and slow). For this goal, IVP embryos were analyzed considering the lipids total amount and membrane lipids characterization during the cleavage early stages (22hpi and 96hpi) and blastocyst stage. The study also included a group of in vivo embryos at the blastocyst stage. The results, using SUDAN BLACK B staining technique, showed a smaller amount of total lipids in the slow groups. The MALDI-MS analysis results showed different patterns of membrane lipids in the fast and slow groups in the cleavage and morulae stages. The data obtained at the blastocyst stage allow us to infer that the slow group is more similar to the in vivo group, since the results showed similarity in relative quantity/intensity in a greater number of ions revealed by multivariate analysis. However, the slow group still shows some similarity with the fast group due to the exposure to the same in vitro environment.
Bilodeau-Goeseels, Sylvie. "Changes in RNA abundance in early bovine embryos." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/nq20726.pdf.
Повний текст джерелаMcDougall, Kathryn Elizabeth. "Alkaline phosphatase isozyme expression in preattachment bovine embryos." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp03/NQ35804.pdf.
Повний текст джерелаYang, Ming Yuan. "Studies on apoptosis in bovine follicles and embryos." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape2/PQDD_0019/NQ56648.pdf.
Повний текст джерелаCebrián, Serrano Alberto. "Factors affecting the in vitro embryo production in cattle associated to ovum pick up sistem." Doctoral thesis, Universitat Politècnica de València, 2013. http://hdl.handle.net/10251/27646.
Повний текст джерелаCebrián Serrano, A. (2013). Factors affecting the in vitro embryo production in cattle associated to ovum pick up sistem [Tesis doctoral no publicada]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/27646
Palancia
Ménétrey, Frédéric. "Multiple preimplantation genetic diagnosis and analysis of bovine embryos /." Zürich : ETH, 2007. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=16581.
Повний текст джерелаChoi, Inchul. "Effects of oocyte on epigenetic reprogramming of bovine SCNT embryos." Thesis, University of Nottingham, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.479364.
Повний текст джерелаMatwee, Christie Nicole. "Apoptosis in the pre-attachment bovine embryo." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape2/PQDD_0021/MQ55691.pdf.
Повний текст джерелаPartridge, Robert James. "The biochemistry of the bovine preimplantation embryo." Thesis, University of York, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.245866.
Повний текст джерелаGibson, Bethany Gale. "Improving the development of bovine in vitro produced embryos cultured individually." Thesis, Virginia Tech, 2014. http://hdl.handle.net/10919/49694.
Повний текст джерелаMaster of Science
Marley, Mylissa Shonda Divina Givens Maurice Daniel. "Assessment of methods to minimize transmission of bovine herpesvirus associated with embryos." Auburn, Ala., 2007. http://hdl.handle.net/10415/1332.
Повний текст джерелаRoberts, Melissa Ann. "Metabolic Regulation and Cryotolerance of In Vitro-Produced Holstein Embryos." DigitalCommons@CalPoly, 2016. https://digitalcommons.calpoly.edu/theses/1693.
Повний текст джерелаRocha, Nathália Alves de Souza [UNESP]. "Efeitos de antioxidantes e da atmosfera gasosa em diferentes etapas da produção in vitro sobre o desenvolvimento e criotolerância de embriões bovinos." Universidade Estadual Paulista (UNESP), 2012. http://hdl.handle.net/11449/98170.
Повний текст джерелаConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
O estudo foi conduzido com o objetivo de avaliar os efeitos da suplementação com antioxidantes intracelulares e extracelulares em diferentes etapas da PIV (MIV e/ou CIV), e da tensão de oxigênio durante o CIV sobre o desenvolvimento e criotolerância de embriões bovinos. No Exp.1 foi realizada a suplementação com antioxidantes {0,6 mM cisteína (CIST), 0,6 mM cisteína associado á 100 μM de cisteamina (C+C) e 100 UI catalase (CAT)} durante todo o período de CIV, em diferentes atmosferas gasosas {5% CO2 em ar (20% O2) ou atmosfera controlada (7% O2, 5% CO2 e 88% N2)}. Já, no Exp. 2 foi realizada a suplementação com antioxidantes {0,6 mM cisteína (CIST), 100 UI catalase (CAT) e 100 μM de β-mercaptoetanol (β-ME)} durante 72 horas de CIV, nas diferentes atmosferas gasosas. Posteriormente, após definir a tensão de oxigênio, bem como, o período de suplementação adequado para o CIV, foi realizada a adição de antioxidantes durante a maturação in vitro (MIV) e/ou 72 horas de CIV (Exp.3). No Exp.1, a taxa de desenvolvimento embrionário foi adversamente afetada (P<0,05) pelos tratamentos CIST (11,2%) e C+C (1,4%), em relação ao Controle (26,6%), e pela tensão de oxigênio (17,2% e 11,1%; 20 e 7% O2, respectivamente). Em relação à taxa de re-expansão, após reaquecimento e cultivo in vitro por 24 horas, não houve diferença significativa (P>0,05) entre os tratamentos avaliados (66,7% a 100%). No Exp.2, as taxas de blastocistos não foram afetadas (P>0,05) pelos tratamentos CIST, β-ME e CAT (43,7% a 48,5%), porém a baixa tensão de oxigênio afetou adversamente (P<0,05) o desenvolvimento embrionário (52,1% e 38,4%; 20 e 7% O2 respectivamente). A mensuração dos níveis intracelulares de ROS não foi afetada (P>0,05) pelas variáveis tratamentos (0,95 a 0,78) e tensão de oxigênio...
This study was conducted to evaluate the effects of intracellular and extracellular antioxidants supplementation, in different stages of IVP (IVM and/or IVC), and oxygen tension during IVC on development, quality and cryotolerance of bovine embryos. Exp.1 was performed with the supplementation with antioxidants {0.6 mM cysteine (CIST); 0.6 mM cysteine associated to 100 μM cysteamine (C+C); 100 UI catalase (CAT)} during entire period of IVC in different gaseous atmospheres {5% CO2 in air (20% O2) or controlled atmosphere (7% O2, 5% CO2 and 88% N2)}. Already, in Exp.2 was performed the antioxidant supplementation {0.6 mM cysteine (CIST); 100 μM β-mercaptoethanol (β-ME); 100 UI catalase (CAT)} for 72 hours of IVC in different gaseous atmospheres. Later, after setting the oxygen tension as well as the supplementation period suitable for IVC, was carried out the addition of antioxidants during in vitro maturation (IVM) and/or 72 hours of IVC (Exp.3). In Exp.1, the rate of embryo development was adversely affected (P<0.05) by the treatments CIST (11.2%) and C+C (1.4%), compared to Control (26.6%), and oxygen tension (17.2% and 11.1%, 20 and 7%O2, respectively). Regarding the re-expansion rate after warming and in vitro culture for 24 hours, no difference (P>0.05) between the treatments were found (66.7% to 100%). In Exp.2, blastocysts rates were not affected (P>0.05) by treatments CIST, β-ME and CAT (43.7% to 48.5%), but the low oxygen tension adversely affected (P<0.05) embryo development (52.1% to 38.4%, 20 and 7%O2, respectively). The quantification of intracellular levels of ROS was not affected (P>0.05) by the variables treatments (0.95 to 0.78) and oxygen tension... (Complete abstract click electronic access below)
Rocha, Nathália Alves de Souza. "Efeitos de antioxidantes e da atmosfera gasosa em diferentes etapas da produção in vitro sobre o desenvolvimento e criotolerância de embriões bovinos /." Jaboticabal : [s.n.], 2012. http://hdl.handle.net/11449/98170.
Повний текст джерелаBanca: Joaquim Mansano Garcia
Banca: Juliana Corrêa Borges Silva
Resumo: O estudo foi conduzido com o objetivo de avaliar os efeitos da suplementação com antioxidantes intracelulares e extracelulares em diferentes etapas da PIV (MIV e/ou CIV), e da tensão de oxigênio durante o CIV sobre o desenvolvimento e criotolerância de embriões bovinos. No Exp.1 foi realizada a suplementação com antioxidantes {0,6 mM cisteína (CIST), 0,6 mM cisteína associado á 100 μM de cisteamina (C+C) e 100 UI catalase (CAT)} durante todo o período de CIV, em diferentes atmosferas gasosas {5% CO2 em ar (20% O2) ou atmosfera controlada (7% O2, 5% CO2 e 88% N2)}. Já, no Exp. 2 foi realizada a suplementação com antioxidantes {0,6 mM cisteína (CIST), 100 UI catalase (CAT) e 100 μM de β-mercaptoetanol (β-ME)} durante 72 horas de CIV, nas diferentes atmosferas gasosas. Posteriormente, após definir a tensão de oxigênio, bem como, o período de suplementação adequado para o CIV, foi realizada a adição de antioxidantes durante a maturação in vitro (MIV) e/ou 72 horas de CIV (Exp.3). No Exp.1, a taxa de desenvolvimento embrionário foi adversamente afetada (P<0,05) pelos tratamentos CIST (11,2%) e C+C (1,4%), em relação ao Controle (26,6%), e pela tensão de oxigênio (17,2% e 11,1%; 20 e 7% O2, respectivamente). Em relação à taxa de re-expansão, após reaquecimento e cultivo in vitro por 24 horas, não houve diferença significativa (P>0,05) entre os tratamentos avaliados (66,7% a 100%). No Exp.2, as taxas de blastocistos não foram afetadas (P>0,05) pelos tratamentos CIST, β-ME e CAT (43,7% a 48,5%), porém a baixa tensão de oxigênio afetou adversamente (P<0,05) o desenvolvimento embrionário (52,1% e 38,4%; 20 e 7% O2 respectivamente). A mensuração dos níveis intracelulares de ROS não foi afetada (P>0,05) pelas variáveis tratamentos (0,95 a 0,78) e tensão de oxigênio... (Resumo completo, clicar acesso eletrônico abaixo)
Abstract: This study was conducted to evaluate the effects of intracellular and extracellular antioxidants supplementation, in different stages of IVP (IVM and/or IVC), and oxygen tension during IVC on development, quality and cryotolerance of bovine embryos. Exp.1 was performed with the supplementation with antioxidants {0.6 mM cysteine (CIST); 0.6 mM cysteine associated to 100 μM cysteamine (C+C); 100 UI catalase (CAT)} during entire period of IVC in different gaseous atmospheres {5% CO2 in air (20% O2) or controlled atmosphere (7% O2, 5% CO2 and 88% N2)}. Already, in Exp.2 was performed the antioxidant supplementation {0.6 mM cysteine (CIST); 100 μM β-mercaptoethanol (β-ME); 100 UI catalase (CAT)} for 72 hours of IVC in different gaseous atmospheres. Later, after setting the oxygen tension as well as the supplementation period suitable for IVC, was carried out the addition of antioxidants during in vitro maturation (IVM) and/or 72 hours of IVC (Exp.3). In Exp.1, the rate of embryo development was adversely affected (P<0.05) by the treatments CIST (11.2%) and C+C (1.4%), compared to Control (26.6%), and oxygen tension (17.2% and 11.1%, 20 and 7%O2, respectively). Regarding the re-expansion rate after warming and in vitro culture for 24 hours, no difference (P>0.05) between the treatments were found (66.7% to 100%). In Exp.2, blastocysts rates were not affected (P>0.05) by treatments CIST, β-ME and CAT (43.7% to 48.5%), but the low oxygen tension adversely affected (P<0.05) embryo development (52.1% to 38.4%, 20 and 7%O2, respectively). The quantification of intracellular levels of ROS was not affected (P>0.05) by the variables treatments (0.95 to 0.78) and oxygen tension... (Complete abstract click electronic access below)
Mestre
Santos, Érika Cristina dos. "Metabolômica para avaliação não invasiva de embriões bovinos produzidos in vitro." reponame:Repositório Institucional da UFABC, 2015.
Знайти повний текст джерелаDissertação (mestrado) - Universidade Federal do ABC, Programa de Pós-Graduação em Biotecnociência, 2015.
A bioenergia destaca-se como um substituto relevante para os combustíveis fósseis e os A capacidade de selecionar o embrião com maior viabilidade para transferência às receptoras é um componente crucial para o sucesso das técnicas de reprodução assistida. Atualmente, avaliações morfológicas são utilizadas para selecionar os embriões com maior potencial de implantação, e apesar de se tratar de um método não invasivo e relativamente bem sucedido, ainda apresenta uma série de limitações. Nos últimos anos, o desenvolvimento de novas tecnologias tem possibilitado análises quantitativas e qualitativas para determinação da viabilidade dos embriões para melhoria da seleção embrionária. Em especial as tecnologias espectroscópicas e espectrométricas permitiram o desenvolvimento de novos métodos para a caracterização embrionária e predição do potencial de estabelecimento da prenhez. Assim, o objetivo deste trabalho foi a caracterização não invasiva de embriões bovinos pela análise dos perfis espectroscópicos e espectrométricos dos meios de cultivo de embriões com diferentes cinéticas de desenvolvimento visando a obtenção de padrões específicos baseados no fenótipo embrionário. Para isso, embriões bovinos foram produzidos in vitro por protocolos convencionais. Os zigotos foram transferidos para meios de cultivo individualmente e classificados em dois grupos: rápido (4 células-40hpi) e lento (2 ou 3 células-40hpi). Os meios de cultura foram coletados às 40, 96 e 168 horas pós-inseminação (hpi), tranferidos para criotubos e congelados a -80ºC até o momento das análises. A análise do metaboloma embrionário foi realizada por espectroscopia Raman. Para tal, gotas de meios de cultura foram cobertas com óleo mineral, sendo escaneadas por um sistema Raman triplo. Os dados foram normalizados e analisados por Análises de Componentes Principais (PCA), de Agrupamentos (Clusters) e por Loading plot. A análise do secretoma embrionário foi feita por MALDI-MS-TOF, através da extração dos metabólitos, sendo os espectros adquiridos pelo espectrômetro em modo de ionização positiva. Foram feitas analises estatísticas univariadas e multivariadas pelo software online Metaboanalyst. Os resultados obtidos pela espectroscopia Raman e espectrometria de massas demonstram que embriões com diferentes cinéticas de desenvolvimento possuem diferentes perfis espectroscópicos e espectrométricos ao longo do desenvolvimento embrionário, indicando que estes embriões consomem e/ou produzem diferencialmente metabólitos nos meios de cultura. Com base em nossos resultados, propomos com este estudo que a análise dos meios de cultura por espectroscopia Raman pode ser utilizada para fins de diagnóstico embrionário, pois permite uma caracterização rápida e global dos perfis embrionários relacionados a cinética, enquanto a espectrometria de massas pode ser utilizada para caracterização qualitativa dos embriões, permitindo a identificação do secretoma de embriões durante o cultivo in vitro.
The ability to select embryo with greater viability to transfer to the receptors is a crucial component to the success of assisted reproduction techniques. Currently, morphological assessments are used to select embryos with the highest implantation potential, although it¿ s a noninvasive and relatively successful, has still a number of limitations. In recent years, the development of new technologies has enabled quantitative and qualitative analyzes for the determination of viability of embryos to improve embryo selection. In particular spectroscopic and spectrometric technologies have permitted the development of new methods for embryo characterization and prediction of potential establishment of pregnancy. The objective of this study was non-invasive characterization of bovine embryos by analysis of spectroscopic and spectrometric profiling of embryo culture media with different kinetics of development in order to obtain specific patterns based on embryonic phenotype. For this, bovine embryos were produced in vitro by standard protocols. The zygotes were transferred to individual culture medium and divided into two groups: Fast (4 cells-40hpi) and slow (2 or 3 cells-40hpi). The culture media were collected at 40, 96 and 168 hours post-insemination (hpi) tranfered to cryotubes and frozen at -80 until the time of analysis. The analysis of the metabolome embryo was made by Raman spectroscopy. For this, droplets of culture media were overlaid with mineral oil being scanned by a triple Raman system. The data were normalized and analyzed by Principal Component Analysis (PCA), clusters and Loading plot. Analysis of embryonic secretome was made by MALDI-TOF-MS, through the extraction of the metabolites, and the spectra acquired by the spectrometer in positive ionization mode. Analyzes were performed univariate and multivariate statistics by the online software Metaboanalyst. The results obtained by Raman spectroscopy and mass spectrometry demonstrated that the development of embryos with different kinetics have different spectroscopic and spectrometric profiles during embryonic development, indicating that these embryos consume and /or produce differentially metabolites in the culture media. Based on our results, we propose that the analysis of Raman spectroscopy culture media may be used for diagnostic purposes embryo, since it allows a fast and comprehensive characterization of embryonic profiles related to kinetics, while mass spectrometry can be used for qualitative characterization of the embryo, allowing the identification of secretome embryo during in vitro culture.
Demant, Myriam. "Qualitative and quantitative proteome analyses of bovine oocytes and early embryos." Diss., lmu, 2012. http://nbn-resolving.de/urn:nbn:de:bvb:19-142446.
Повний текст джерелаRodriguez-Osorio, Nelida. "MOLECULAR REPROGRAMMING IN BOVINE EMBRYOS AFTER SERIAL SOMATIC CELL CHROMATIN TRANSFER." MSSTATE, 2008. http://sun.library.msstate.edu/ETD-db/theses/available/etd-04022008-095409/.
Повний текст джерелаMcHughes, Courtney Elizabeth Prather Randall S. "Identification and quantification of differentally represented transcripts in preimplantation bovine embryos." Diss., Columbia, Mo. : University of Missouri--Columbia, 2007. http://hdl.handle.net/10355/5020.
Повний текст джерелаAnderson, Bret L. "Effects of Antioxidants on Development of In Vitro Fertilized Bovine Embryos." DigitalCommons@USU, 1995. https://digitalcommons.usu.edu/etd/3920.
Повний текст джерелаByrne, Annette Therese. "Analysis of apoptosis in the preimplantation mammalian embryo." Thesis, University of York, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.310908.
Повний текст джерелаArnold, Daniel Robert. "Regulation of trophoblast development in the bovine embryo." Thèse, [Montréal] : Université de Montréal, 2005. http://proquest.umi.com/pqdweb?index=0&did=1221731981&SrchMode=1&sid=1&Fmt=6&VInst=PROD&VType=PQD&RQT=309&VName=PQD&TS=1191513626&clientId=48948.
Повний текст джерелаTitre de l'écran-titre (visionné le 4 oct. 2007). "Thèse présentée à la Faculté des études supérieures en vue de l'obtention du grade de Philosophiae Doctor (Ph.D.) en sciences vétérinaires option reproduction" Paraît aussi en version papier et en version microforme.
Lott, Whitney Meghan. "Influence of Growth Factors on Bovine Embryo Development." Thesis, Virginia Tech, 2008. http://hdl.handle.net/10919/34481.
Повний текст джерелаMaster of Science
Jimenez, Escobar Claudia. "Association of bovine viral diarrhea virus with day-7 bovine embryos produced under different culture conditions." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2002. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp05/NQ66111.pdf.
Повний текст джерелаAl, Darwich Abdulrahman. "Métabolisme lipidique et cryorésistance des embryons dans l’espèce bovine." Thesis, Tours, 2009. http://www.theses.fr/2009TOUR4031/document.
Повний текст джерелаIn vitro produced embryos are more sensitive to cryopreservation than those in vivo derived, partly because of their fat content, triglycerides and phospholipids. The objective of this work was to understand the molecular mechanisms responsible for this difference. mRNA expression of genes involved in lipid metabolism has been established. Results of adipophilin mRNA level indicates that it maybe a specific marker for triglycerides accumulation and embryo cryorésistance. Thus, triglyceride accumulation could be related to a lack of lipids degradation rather than new lipids synthesis only. Polyunsaturated fatty acids supplementation, C18: 2 C18: 3 or DHA in culture media regulated mRNA expression of SCD1 and FADS2, two enzymes involved in lipids desaturation, probably through SREBP1 regulation, which could be directly linked to changes in the balance of saturated / unsaturated fatty acids and could contribute to change membrane fluidity and embryo cryoresistance
Kawarsky, Sheldon Jerald. "Effects of elevated temperature on bovine oocytes and embryos cultured in vitro." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape7/PQDD_0001/NQ40376.pdf.
Повний текст джерелаPichugin, Andrey. "Nuclear architecture in normal and cloned bovine early embryos : dynamics of heterochromatin." Versailles-St Quentin en Yvelines, 2008. http://www.theses.fr/2008VERS0005.
Повний текст джерелаDevelopmental reprogramming during mammalian fertilization and pre-implantation development in in vitro fertilized (IVF) embryos is a complex process that allows the highly differentiated gametes to revert to undifferentiated cell types following syngamy and then gradually differentiate into individual cell lineages. These processes involve changes in chromatin structure, in global epigenetic modifications and in nuclear architecture of embryonic nuclei. The objective of the present study was to develop approaches for understanding these series of phenomena in early embryos. We used the possibility to compare normal (IVF) and nuclear tranfer (NT) embryos in bovine species where the pre-implantation development is long enough to assess the nuclear dynamics of reprogramming events before major embryonic genome activation. In a first approach, we studied the establishment of heterochromatin pattern specific for embryo during the reprogramming period in IVF and NT bovine embryos. We applied two markers of pericentric heterochromatin: heterochromatin protein 1 (HP1beta) and tri methylated histone H3 (H3K9me3); and a marker of centromeres (CENPA/B), in order to characterize structural parameters of constitutive heterochromatin in early stages of development. Using immunofluorescence technique, we were able to observe dynamic changes in heterochromatin organization in connection with embryos origin. In IVF and some NT embryos, heterochromatin was observed in dispersed state up to the 8-cell stage, and then in a condensed pattern corresponding to the well characterized chromocenters constituted by blocks of HP1beta and H3K9me3 associated with centromeres. However, a significant part of NT embryos underwent an altered dynamics of heterochromatinization characterized by a precocious heterochromatin condensation as soon as the 2-cell stage. In a second approach, we used senescent somatic cells as donors for nuclear transfer experiments in order to assess the influence of structural organization of donor cell nucleus on structural organization of nuclei in cloned embryos. Surprisingly, the large-scale three-dimensional arrangement of heterochromatin within the senescent-NT nucleus recapitulated the dynamics observed in IVF or somatic non-senescent NT embryos, with comparable percentages of embryos with dispersed and precociously condensed heterochromatin similar to those observed in the previous investigation. These results suggest that a robust process of epigenetic reprogramming is piloted by bovine oocyte in early embryos. The altered kinetics in genome restructuring in some NT embryos might be linked to the precocious transcriptional activation and precocious increase of DNA methylation level reported in other studies. The present work allowed us to point out the distinction between NT embryos with correct developmental reprogramming and abnormal, at least temporally, epigenetic reprogramming, as well as to demonstrate that the impact of nuclear organization of heterochromatin in the donor cell on structural organization of nucleus in NT embryos is relatively low. This may account for the relatively high development efficiency in bovine cloning as compared to other species
Nociti, Ricardo Perecin. "Transcrição em embriões bovinos produzidos in vitro /." Jaboticabal, 2018. http://hdl.handle.net/11449/157385.
Повний текст джерелаResumo: O processo transcricional em embriões extremamente complexo, nosso trabalho estimou o impacto de perturbações nos processos de transcricionais, durante as fases de ativação do genoma embrionário sobre o desenvolvimento embrionário in vitro de embriões; analisamos dados de sequenciamento de rna (RNA-seq) depositados nos bancos públicos (GEO) desde o estágio de oóocito até o dia 19 do desenvolvimento embrionário; Isolamos e caracterizamos a massa celular interna (ICM) e a trofectoderma (TE) do sexo masculino e feminino, oriundos de um mesmo blastocisto produzido in vitro com espermatozoides sexados (X e Y) e com sêmen convencional e caracterizamos e exploramos o transcriptoma desses isolados celulares. Concluímos então que a EGA menor é essencial para o desenvolvimento embrionário bovino, blastocistos possuem a maior atividade transcricional de um total de 6457 genes diferentemente expressos entre os contrastes avaliado encontramos; 2065 genes diferencialmente expressos entre a ICM e a TE, enquanto a ICM está voltada para a manutenção da pluripotência, a TE está voltada ao metabolismo energético. Os nossos dados sugerem que os embriões fêmeas são mais sensíveis ao cultivo in vitro.
Abstract: Transcription process in embryos is a complex process, our work estimated the impact of perturbations in the transcriptional processes during genome activation of vitro produced bovine embryos on their development; we analyzed public data (GEO) from rna sequencing data (RNA-seq) of oocyte up to the 19th day of embryonic development; We’d performed isolation and characterization of male and female inner cell mass (ICM) and trofectoderma (TE) from the same blastocyst produced in vitro with sorted semen (X and Y) and with conventional semen. We did the characterization and exploratory analysis of the transcriptome of these cells. We conclude that minor EGA is essential for bovine embryonic development. Blastocysts possess the highest transcriptional activity of 6457 differentially expressed genes among analyzed contrasts. We found 2065 genes differentially expressed between ICM and TE, while ICM is maintaining pluripotency, TE is focused on energy metabolism. Our data suggest that female embryos are more sensitive to in vitro culture.
Doutor
Menges, Suzanne Lynn. "The use of laser-assisted hatching in bovine in vitro produced embryos to improve pregnancy rate." Thesis, [College Station, Tex. : Texas A&M University, 2008. http://hdl.handle.net/1969.1/ETD-TAMU-3049.
Повний текст джерелаNganvongpanit, Korakot. "Functional analysis of genes during bovine preimplantation embryo development." [S.l.] : [s.n.], 2006. http://deposit.ddb.de/cgi-bin/dokserv?idn=980875153.
Повний текст джерелаGopichandran, Nadia. "The development and metabolism of the bovine preimplantation embryo." Thesis, University of York, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.428455.
Повний текст джерелаFerreira, Marcos Brandão Dias [UNESP]. "Obtenção de oócitos e produção in vitro de embriões em doadoras lactantes da raça Gir (Bos taurus indicus)." Universidade Estadual Paulista (UNESP), 2011. http://hdl.handle.net/11449/105910.
Повний текст джерелаFundação de Amparo à Pesquisa do Estado de Minas Gerais (FAPEMIG)
Raças zebuínas (Bos taurus indicus) e seus cruzamentos têm papel fundamental na pecuária brasileira, e a raça Gir, em especial, acrescenta rusticidade e produtividade nas suas descendentes leiteiras. A produção in vitro de embriões bovinos é uma biotécnica de alto valor econômico, que, aliada à utilização de sêmen sexado para cromossoma X, possibilita a multiplicação com fêmeas de valor genético superior. Foram realizados dois experimentos com o objetivo de avaliar a produção in vitro (PIV) de embriões de doadoras da raça Gir na Fazenda Experimental da EPAMIG, em Uberaba, MG. O experimento 1 (EXP 1) visou verificar o efeito da ablação do folículo dominante sobre os resultados da PIV. No experimento 2 (EXP 2) os efeitos da estação do ano, idade da doadora, DNA mitocondrial materno e efeito do touro sobre a PIV foram estudados. No EXP 1, 42 multíparas e primíparas foram submetidas à aspiração de oócitos (OPU) a partir dos 15 dias pós-parto e a intervalos de 21 dias, sendo efetuada (65 sessões de OPU) ou não (115 sessões de OPU) a ablação do folículo dominante 3 dias antes da aspiração. Das 198 aspirações realizadas foram coletados 3.884 oócitos viáveis, que resultaram em 1.114 blastocistos. O número médio de oócitos viáveis aspirados e de blastocistos por sessão foi de 20,0 ± 10,6 e de 5,70 ± 4,9, respectivamente. Não foram identificados efeito da ordem de parto e aspiração, do dia após o parto para início da coleta e da condição corporal da doadora nos resultados da PIV. No entanto, a produção de blastocistos por sessão foi superior (5,65±1,02 vs. 3,78±0,97) nas vacas que sofreram ablação do folículo dominante (p<0,05). No EXP 2 foram avaliadas 363 aspirações de 85 doadoras fertilizadas com 23 touros diferentes que geraram 6.084 oócitos viáveis, 2.537 embriões, 1.105 gestações...
Zebu breeds (Bos taurus indicus) and its crosses have an essential role on the Brazilian cattle industry, and the Gyr breed, especially, incorporates hardiness and productivity onto its dairy descendants. The in vitro production of bovine embryos is a biotechnique of high economic value, which, combined to the use of sex-sorted semen bearing X chromosomes, allows for the multiplication of superior genetic value dams. Two experiments were conducted to evaluate the in vitro production (IVP) of embryos from Gyr donor cows at the EPAMIG Research Farm in Uberaba, MG, Brazil. Experiment 1 (EXP 1) aimed to verify the effect of ablation of the dominant follicle on IVP results. In experiment 2 (EXP 2), the effects of season, donor age, mitochondrial DNA and sire on IVP were studied. In EXP 1, 42 multiparous and primiparous cows underwent ovum pick up (OPU) after removal (65 OPU sessions- DFR) or non removal (115 OPU sessions- Control) of the dominant follicle 3 days before aspiration, starting from 15 days postpartum at approximately 21 day-intervals. Of the 180 OPU sessions performed, 3,884 viable oocytes were collected, which resulted in 1,114 blastocysts. The overall average numbers of oocytes aspirated and viable blastocysts per session were 20.0 ± 10.6 ± 4.9 and 5.70, respectively. OPU session, parity, calving to OPU interval and donor body condition did not influence IVP results. However, the production of blastocysts per session was higher (5.65 ± 1.02 vs. 3.78 ± 0.97) in DFR-cows (P <0.05). In EXP 2, a total of 363 OPU sessions from 85 donors was studied. Semen from 23 different bulls was used for in vitro fertilization, yielding 6,084 viable oocytes, 2,537 embryos and 1,105 pregnancies overall. Thirty and sixty-day day pregnancy rates after embryo transfer were 41.7% and 39.5%, respectively... (Complete abstract click electronic access below)
Bruyère, Pierre. "Evaluation thermodynamique et biologique d’un substituant synthétique aux produits d’origine animale dans les solutions de cryoconservation pour embryons de mammifères." Thesis, Lyon 1, 2012. http://www.theses.fr/2012LYO10145/document.
Повний текст джерелаSeveral compounds in embryo cryopreservation solutions are a source of concern:products of animal origin because of the sanitary risks, and the permeating cryoprotectantsbecause of their potential mutagenic effect. Removing or substituting these compounds withchemically defined products might improve embryo cryopreservation technics.Conception and use of cryopreservation protocols are often empirical. This empiricismleads to many variations between the studies which make a comparison between results allthe more difficult. In our study, two complementary approaches were associated:• The first approach (physical) consisted of using the differential scanning calorimetry tostandardize the comparison between different slow-freezing solutions. So, thethermodynamic properties of solutions containing a potential substitute were characterizedand compared to those obtained with solutions containing reference products (fetal calfserum and bovine serum albumin) ;• The second approach (biological) consisted of using freezing of in vivo-produced rabbitembryos or freezing of in vitro-produced bovine embryos in order to evaluate survival
Kramer, Joseph Michael. "Gene expression in bovine in vitro produced embryos, nuclear transfer-derived embryos, and donor cells using real-time reverse transcription polymerase chain reaction." [Gainesville, Fla.] : University of Florida, 2005. http://purl.fcla.edu/fcla/etd/UFE0010362.
Повний текст джерелаBastos, Michele Ricieri [UNESP]. "Influência da ingestão de matéria seca e da condição corporal na produção in vitro de embriões bovinos." Universidade Estadual Paulista (UNESP), 2008. http://hdl.handle.net/11449/98215.
Повний текст джерелаConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
Objetivou-se avaliar o efeito da condição corporal e/ou da alta ingestão de matéria seca (AIMS) na produção in vivo de embriões de fêmeas bovinas superovuladas. Em um primeiro experimento, 14 vacas Simental x Nelore não-lactantes com elevado escore de condição corporal (ECC) foram divididas em grupos de Manutenção=M ou alta ingestão de matéria seca=AIMS. As vacas do grupo AIMS receberam dieta com 180% da manutenção, entre 7 dias antes do início da superovulação (SOV) e o final das aplicações de FSH. O grupo M recebeu dieta de manutenção. O número de folículos recrutados e ovulados não diferiu entre os grupos (P>0,10). Entretanto, os números de estruturas totais e embriões viáveis colhidos foram maiores no grupo M (P<0,05). Em um segundo experimento avaliou-se a influência do ECC associado ou não da AIMS na produção embrionária em 36 novilhas Nelore. AIMS ocorreu por 14 dias antes do início da SOV. Após colheita, os embriões viáveis foram congelados para posterior cultivo até eclosão. Não houve diferença entre os grupos na população folicular ao início da SOV, na resposta superestimulatória ou superovulatória, nem no número ou qualidade dos embriões colhidos. As novilhas com
Flood, Mark Randall. "Effect of Various Growth-Promoting Factors on Preimplantation Bovine Embryo Development in Vitro." DigitalCommons@USU, 1992. https://digitalcommons.usu.edu/etd/4044.
Повний текст джерелаMoreira, Vanessa. "Improving biosecurity of bovine in vitro embryo production and cryopreservation." Thesis, Available from the University of Aberdeen Library and Historic Collections Digital Resources, 2009. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?application=DIGITOOL-3&owner=resourcediscovery&custom_att_2=simple_viewer&pid=25708.
Повний текст джерелаHarvey, Alexandra Juanita. "Expression of hypoxia-inducible factors during bovine preimplantation embryo development /." Title page, abstract and table of contents only, 2003. http://web4.library.adelaide.edu.au/theses/09PH/09phh3410.pdf.
Повний текст джерелаFerguson, Elizabeth Mary. "Endogenous energy stores in the bovine oocyte and early embryo." Thesis, University of York, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.423763.
Повний текст джерелаSedano, Rodolfo Canseco. "Effect of immunoglobulins on early bovine embryo development in vitro." Thesis, Virginia Tech, 1985. http://hdl.handle.net/10919/41575.
Повний текст джерелаMaster of Science
Cordova, Amanda. "Co-culture d'embryons bovins et de cellules épithéliales d'oviducte : un modèle in vitro pour la compréhension du dialogue embryo-maternel précoce." Thesis, Tours, 2013. http://www.theses.fr/2013TOUR4030.
Повний текст джерелаThe oviduct plays a pivotal role in gametes transport and final capacitation, as well as in fertilization and early embryo development. An embryo-maternal communication takes place to ensure the successful early embryo development and transport towards its implantation site. The principal aim of this research was to confirm the existence of such early embryo-maternal molecular and functional dialogue using bovine oviduct epithelial cells (BOEC) as coculture to support the development of in vitro produced bovine embryos. We showed that BOEC had an important effect on early embryo development, especially during the first 4 days. This effect translates into accelerated cleavage kinetics, modulation of gene expression after embryonic genome activation, increased rate of embryo development to the blastocyst stage and improved gene expression profile. Moreover the embryos are triggering a BOEC response by upregulating genes related to interferon signaling. A regional specificity of gene expression profile in the oviduct has also been detected
ANJOS, Rafael Soares dos. "Produção in vitro de embriões e expressão gênica de IGF-I e IGF-II em embriões de fêmeas bovinas da raça nelore submetidas a administrações de somatotropina recombinante bovina." Universidade Federal Rural de Pernambuco, 2014. http://www.tede2.ufrpe.br:8080/tede2/handle/tede2/5064.
Повний текст джерелаMade available in DSpace on 2016-07-25T15:23:31Z (GMT). No. of bitstreams: 1 Rafael Soares dos Anjos.pdf: 731600 bytes, checksum: 7d6737e5dd35933a588f91ac8e29789d (MD5) Previous issue date: 2014-02-26
In vitro production of bovine embryos (IVP) is a tool that serves to increase reproductive potential of females considered exceptional, especially, as an instrument to accelerate the progress of animal selection programs. In order to improve results, exogenous synthetic hormones are being used routinely in the animal reproduction industry. Currently there is a research using recombinant bovine somatotropin (rbST), as a substance that causes the increase in receptors for insulin-like growth factor (IGF). Both IGFs type I and type II and its receptors (IGF-IR and IGF-IIR) are expressed in in vitro produced bovine and ovine oocytes and embryos from which one can prove the close relation of IGF system with the IVP. Researches have proven a trend in oocyte quality improvement in animals treated with rbST, as well as increased fertilization rate and embryo quality improvement. This experiment aimed to study the effect of rbST on quantity and quality of in vivo aspirated oocytes, embryo production and gene expression of IGF-I and IGF-II in vitro produced embryos of bovine females of Nelore breed. Five cows were treated with two administrations of 2mL of saline solution as a placebo, with an interval of 14 days between them, being the first administration performed 19 and the second 5 days before follicular aspirations; 30 days after these aspirations, in crossover system, same protocol was used in these five animals being, in this case, the saline solution replaced by 500mg of rbST in order to compare treatments. It was held to IVP of oocytes recovered from this research, being all the steps that involve this process evaluated with subsequent achievement of polymerase chain reactions in real time (qPCRs) for gene expression of IGF-I and IGF-II in the blastocysts produced in the experiment. No difference was observed on quantity and quality of aspirated oocytes in vivo, embryo production and gene expression of IGF-I and IGF-II in vitro produced embryos of bovine females of Nelore breed under the influence of rbST.
A produção in vitro de embriões (PIVE) bovinos constitui-se em uma ferramenta que serve para aumentar o potencial reprodutivo de fêmeas consideradas excepcionais, principalmente, como instrumento para acelerar o progresso dos programas de seleção animal. Com o intuito de melhorar taxas e índices, sintéticos exógenos vêm sendo utilizados corriqueiramente na área da reprodução animal. Pesquisa-se atualmente a utilização da somatotropina recombinante bovina (rbST), tida como substância que acarreta o aumento de receptores para o fator de crescimento semelhante à insulina (IGF). Tanto os IGFs tipos I e II como seus receptores (IGF-IR e IGF-IIR) são expressos em oócitos e embriões bovinos e ovinos produzidos in vitro - o que pode comprovar a relação do sistema IGF com a PIVE. Estudos tem comprovado tendência em melhora da qualidade oocitária nos animais tratados com rbST, bem como aumento da taxa de fecundação e melhoria na qualidade de embriões. Este experimento objetivou estudar a influência da rbST sobre a quantidade e qualidade de oócitos aspirados in vivo, produção embrionária e expressão gênica de IGF-I e IGF-II em embriões produzidos in vitro de fêmeas bovinas da raça Nelore. Cinco vacas foram tratadas com duas administrações de 2mL de solução salina como placebo, com intervalo de catorze dias entre elas, sendo a primeira administração realizada dezenove e a segunda cinco dias antes das aspirações foliculares; decorridos trintas dias após estas aspirações, em sistema crossover, o mesmo protocolo foi utilizado nesses cinco animais sendo, neste caso, a solução salina substituída por 500mg de rbST, com o intuito de efetuar-se comparações entre os tratamentos. Realizou-se a PIVE a partir dos oócitos recuperados nesta pesquisa, sendo todas as etapas que envolvem este processo analisadas e com posterior realização de reações em cadeia da polimerase em tempo real (qPCRs) para expressões gênicas de IGF-I e IGF-II nos blastocistos produzidos. Observou-se que a rbST não exerceu influência significativa sobre a quantidade e qualidade de oócitos aspirados in vivo, produção embrionária e expressão gênica de IGF-I e IGF-II em embriões produzidos in vitro de fêmeas bovinas da raça Nelore.
Pavani, Krishna Chaitanya. "Optimization of a specific messenger RNA extraction protocol for fresh and vitrified bovine oocytes to gene expression studies : Specific mRNA extraction protocol for bovine oocytes." Thesis, University of the Azores, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:his:diva-6900.
Повний текст джерелаTejomurtula, Jyothsna. "Identification of a novel importin [alpha] predominantly expressed in bovine oocytes and early embryos." Morgantown, W. Va. : [West Virginia University Libraries], 2007. https://eidr.wvu.edu/etd/documentdata.eTD?documentid=5488.
Повний текст джерелаTitle from document title page. Document formatted into pages; contains vi, 45 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 40-45).
Reis, Alexandra. "Fatty acid and antioxidant effects on development in vitro of bovine and ovine embryos." Thesis, University of Aberdeen, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.401191.
Повний текст джерелаOrozco, Lucero Ernesto. "Role and modulation of maternal transcripts during the first cleavage divisions in bovine embryos." Doctoral thesis, Université Laval, 2016. http://hdl.handle.net/20.500.11794/27002.
Повний текст джерелаThis work explores the identity, the function, and the regulation of maternal mRNA molecules that drive developmental competence shortly after fertilization in cattle. First of all, by using the model of the time of first zygotic cleavage and assessing the transcriptome of 2-cell embryos, it was possible to determine the molecular fingerprint of extreme levels of developmental competence and select candidate molecules for further monitoring. Data implied that early embryos of variable developmental capacity differ in functions including DNA repair, RNA processing, protein synthesis, and gene expression that are dictated by oocyte-synthesized mRNA. To obtain a functional confirmation, a pair of maternal transcripts (one detected in our previous survey and other related molecule) were knocked-down in oocytes that were further cultured. The effects of ablating these transcription factors were evident before blastocyst formation due to a decrease in cleavage capacity, as well as progression past the 8-cell stage. The molecular analysis of surviving knocked-down embryos suggested that one of these transcription factors is a pivotal orchestrator of the activation of the embryonic genome, a critical developmental window in early embryogenesis. In the last survey, we asked whether the transcription factors of interest are modulated at the translational level. Reporter mRNAs containing either short or long versions of the 3’-UTR sequences of both molecules were injected in zygotes to look at their translational dynamics. Results showed that cis-acting elements located in the 3’-UTRs govern their timely translation and suggested an association between developmental competence and protein synthesis capacity. This led to the notion that these crucial transcription factors are also controlled at the translational level in early embryos. The acquired knowledge was instrumental to define the possible control operated by maternal molecules on embryos at the onset of their development, as well as some of the challenges and potential use of this information in the field of reproductive technologies.