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DC Field | Value | Language |
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dc.contributor.author | Grillo, Gustavo Fernandes | - |
dc.date.accessioned | 2024-09-27T14:23:43Z | - |
dc.date.available | 2024-09-27T14:23:43Z | - |
dc.date.issued | 2021-09-27 | - |
dc.identifier.citation | GRILLO, Gustavo Fernandes. Perdas gestacionais em bovinos de leite em programas de transferência de embriões e a participação de Neospora caninum. 2021. 42 f. Tese (Doutorado em Medicina Veterinária) - Instituto de Veterinária, Universidade Federal Rural do Rio de Janeiro, Seropédica, 2021. | pt_BR |
dc.identifier.uri | https://rima.ufrrj.br/jspui/handle/20.500.14407/18271 | - |
dc.description.abstract | O uso de biotécnicas, evoluiu de forma significativa nas últimas décadas, proporcionando aumento da eficiência reprodutiva. A Inseminação Artificial em Tempo Fixo (IATF), Transferência de Embriões (TE) e a Fertilização in vitro (FIV), são as que mais evoluíram e apesar de sua capacidade é necessária a compreensão dos fatores relacionados ao seu sucesso para a aplicação das mesmas, assim o desenvolvimento de estudos que avaliem a resposta superovulatória, as taxas de prenhez e perdas gestacionais podem contribuir para o aumento da eficácia. Assim, dois experimentos foram desenvolvidos. O primeiro teve como objetivo avaliar a viabilidade da Transferência de embriões oriundos de vacas soropositivas para Neospora caninum em protocolos de superovulação e detectar, através da técnica de PCR, o DNA do parasita em embriões e lavados uterinos. Entre receptoras de embriões provenientes de doadoras soropositivas e soronegativas não foram encontradas diferenças na taxa de prenhez (60 e 57,1%, P=0,57), perda gestacional (50% e 43,8%, P=0,79) e número de embriões produzidos após superovulação (40 e 51, P=0.64). Não houve também alteração do status sorológicos das receptoras, assim como não foram identificados o DNA do protozoário em embriões e amostras de PBS da lavagem uterina realizada para a coleta de embriões. Demonstrou-se que a técnica de TE é segura e pode ser utilizada em programas de controle da neosporose, ressaltando que apesar da similaridade no número de embriões, houve diferença significativa no número de estruturas congeláveis (25% e 74%, P<0,0001) e transferíveis (27,5% e 78,4%, P<0,0001). O segundo estudo avaliou o efeito do aumento da progesterona circulante (P4) pela indução da formação de corpo lúteo acessório (CL) em receptoras de embriões clonados (TNCS) e produzidos in vitro (FIV). O tratamento com hCG causou ovulação e aumentou a P4 circulante, e houve uma tendência de aumento nas prenhezes por TE (P/TE) para receptoras de embriões TNCS nos dias 28 (P = 0,07) e 42 (P = 0,09). As taxas de prenhez foram semelhantes para embriões FIV e TNCS nos dias 28 e 33, no entanto, P/TE foi maior para FIV do que TNCS no dia 42 e mais tarde, devido a maiores (P = 0,05) perdas de gestação no TNCS (44,4%) do que embriões FIV (15,0%) dos dias 33-42. Assim, o aumento da P4 circulante pode melhorar a fertilidade em receptoras de embriões TNCS, como evidenciado pela tendência do tratamento com hCG para aumentar P/ET. Houveram perdas gestacionais em ambos experimentos, principalmente em embriões TNCS, concluiu-se que não houve diferença no número de embriões, taxas de prenhez e perda gestacional na superovulação de fêmeas soropostivas e negativas para N.caninum. Os embriões não foram meios de transmissão para doença e pode ser utilizado em programas de controle da doença, ressalta-se porém que a houve diferença na qualidade dos embriões. O aumento da progesterona por produção de CL acessórios gerou uma tendência de melhora da prenhez em embriões TNCS, porém não foi capaz de reduzir as perdas gestacionais. Outros mecanismos além da concentração da progesterona devem ser investigados para melhorar a eficiência da TE em TNCS. | pt_BR |
dc.description.sponsorship | Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES | pt_BR |
dc.language | por | pt_BR |
dc.publisher | Universidade Federal Rural do Rio de Janeiro | pt_BR |
dc.subject | TE | pt_BR |
dc.subject | perdas gestacionais | pt_BR |
dc.subject | taxa de prenhez | pt_BR |
dc.subject | ET | pt_BR |
dc.subject | gestacional losses | pt_BR |
dc.subject | pregnancy rates | pt_BR |
dc.title | Perdas gestacionais em bovinos de leite em programas de transferência de embriões e a participação de Neospora caninum | pt_BR |
dc.title.alternative | Gestational losses in dairy cattle in embryo transfer programs and the participation of the Neospora caninum | en |
dc.type | Tese | pt_BR |
dc.description.abstractOther | The use of biotechniques as a reproductive management tool has evolved significantly in recent decades, increasing reproductive efficiency in dairy cattle. Among the biotechniques, Fixed- Time Artificial Insemination (FTAI), Embryo Transfer (ET) and in vitro Fertilization (IVF) the most evolved and currently used in reproductive programs for dairy herds. Despite their capacity, it is necessary to understand the factors related to their success for their application, thus the development of studies that assess the superovulatory response, pregnancy rates and pregnancy losses can contribute to increased effectiveness. The strict sanitary control of the herds becomes essential so that the respective programs can provide the expected gains in reproductive efficiency. In this way, two experiments were developed. The first experiment aimed to detect, through the PCR technique, the DNA of Neospora caninum in embryos from seropositive cows in superovulation protocols for embryo transfer. Among recipients of embryos from seropositive and seronegative donors, no differences were found in the pregnancy rate (60 and 57.1%, P=0.57), gestational loss (50% and 43.8%, P=0.79) and number of embryos produced after superovulation (40 and 51, P=0.64). There was also no change in the serological status of the recipients, regardless of the status of the donor, as well as the protozoan DNA in embryos and PBS samples from the uterine lavage performed for embryo flushing were not identified. Thus, it can be demonstrated that the TE technique is safe and can be used in neosporosis control programs, noting that despite the similarity in the number of embryos, there was a significant difference in the number of freezeable (25% and 74%, P <0.0001) and transferable (27.5% and 78.4%, P<0.0001) structures. The second study evaluated the effect of increasing circulating progesterone (P4) by inducing accessory corpus luteum (CL) formation in recipients of cloned (SCNT) and in vitro produced (IVF) embryos. As expected, treatment with hCG caused ovulation and increased circulating P4, although hCG tended to increase pregnancies by ET (P/ET) for SCNT embryo recipients on days 28 (P = 0.07) and 42 (P = 0.09). Pregnancy rates were similar for IVF and SCNT embryos on days 28 and 33, however, P/ET was higher for IVF than SCNT on day 42 and later, due to higher (P = 0.05) pregnancy losses in SCNT (44.4%) than IVF embryos (15.0%) from days 33-42. Thus, increasing circulating P4 may improve fertility in recipients of SCNT embryos, as evidenced by the tendency of treatment with hCG to increase P/ET of SCNT embryos. Although additional research is needed, it can be concluded that ET is a viable technique for the genetic improvement of the herd, which can also be used to control diseases such as bovine neosporosis. | pt_BR |
dc.contributor.advisor1 | Mello, Marco Roberto Bourg de | - |
dc.contributor.advisor1ID | https://orcid.org/0000-0002-9790-4764 | pt_BR |
dc.contributor.advisor1Lattes | http://lattes.cnpq.br/3560332978218414 | pt_BR |
dc.contributor.advisor-co1 | Spyrides, Andressa Ferreira da Silva | - |
dc.contributor.advisor-co1ID | ttps://orcid.org/0000-0002-4800-767X | pt_BR |
dc.contributor.advisor-co1Lattes | http://lattes.cnpq.br/5459145983025712 | pt_BR |
dc.contributor.advisor-co2 | Palhano, Helcimar Barbosa | - |
dc.contributor.advisor-co2Lattes | http://lattes.cnpq.br/7209482538393591 | pt_BR |
dc.contributor.referee1 | Mello, Marco Roberto Bourg de | - |
dc.contributor.referee1ID | https://orcid.org/0000-0002-9790-4764 | pt_BR |
dc.contributor.referee1Lattes | http://lattes.cnpq.br/3560332978218414 | pt_BR |
dc.contributor.referee2 | Jesus, Vera Lucia Teixeira de | - |
dc.contributor.referee2Lattes | http://lattes.cnpq.br/6838386218159684 | pt_BR |
dc.contributor.referee3 | Teixeira, Edwards Frazão | - |
dc.contributor.referee3Lattes | http://lattes.cnpq.br/3970635682513329 | pt_BR |
dc.contributor.referee4 | Ferreira, Joaquim Esquerdo | - |
dc.contributor.referee4Lattes | http://lattes.cnpq.br/2145101630651788 | pt_BR |
dc.contributor.referee5 | Dias, Angelo José Burla | - |
dc.contributor.referee5Lattes | http://lattes.cnpq.br/9765923327693409 | pt_BR |
dc.creator.Lattes | http://lattes.cnpq.br/8282359648043626 | pt_BR |
dc.publisher.country | Brasil | pt_BR |
dc.publisher.department | Instituto de Veterinária | pt_BR |
dc.publisher.initials | UFRRJ | pt_BR |
dc.publisher.program | Programa de Pós-Graduação em Medicina Veterinária (Patologia e Ciências Clínicas) | pt_BR |
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Efficacy of progesterone supplementation during early pregnancy in cows: A meta-analysis. Theriogenology, v. 85, p.1390–8, 2016. | pt_BR |
dc.subject.cnpq | Medicina Veterinária | pt_BR |
Appears in Collections: | Mestrado em Medicina Veterinária (Patologia e Ciências Clínicas) |
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