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Previous issue date: 2016-07-01 / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) / A composição dos lipídeos da membrana espermática e do plasma seminal estão entre os fatores que podem influenciar a capacidade fecundante do sêmen. Desta maneira, este estudo objetivou analisar as diferenças do perfil lipídico do ejaculado de bovinos da raça Nelore, resistentes e sensíveis à criopreservação. Foram utilizados 15 touros da raça Nelore para colheitas de sêmen utilizando eletroejaculador. Os ejaculados foram diluídos com meio convencional na concentração de 25x106 espermatozoides/palheta. Os animais foram divididos em dois grupos conforme a resistência pós-criopreservação, grupo A (Bad freezer, touros sensíveis à criopreservação) e grupo B (Good freezer, touros resistentes à criopreservação). O sêmen fresco foi analisado quanto morfologia realizada por microscopia de interferência diferencial (DIC), cinética espermática e integridade da membrana. Na pós-descongelação as amostras foram avaliadas quanto a cinética espermática, integridade das membranas plasmáticas e acrossomal, caspase ativa, peroxidação lipídica. A análise do perfil de lipídios foi realizada por espectrometria de massa MALDI-MS. Foi possível observar diferença no perfil lipídico dos espermatozoides e do plasma seminal entre os grupos, com maior abundância relativa dos íons m/z 704,59; m/z 804,59 e m/z 943,77 no grupo A nos espermatozoides. No plasma seminal houve maior abundância relativa de 34 íons lipídicos nos touros do grupo B. Assim sendo, conclui-se que existe diferença no perfil de lipídios dos espermatozoides e no plasma seminal de touros sensíveis ou resistentes à criopreservação. / Lipid compositions of the sperm membrane are among the factors that can influence the semen fertilizing capacity. Likewise, the lipid composition of seminal plasma can interfere in sperm quality. In this sense, this study aimed to analyze differences between lipid profile of the ejaculate and sperm parameters from bulls (Nelore breed) wich are resistant and susceptible to cryopreservation. In the study 15 Nelore bulls were used for semen collection by electroejaculation. The samples were diluted with yolk egg-based extender (Botu-Bov®). The animals were divided into two groups according to semen quality after cryopreservation: group A (Bad freezer, bulls sensitive to cryopreservation) and group B (Good freezer, bulls resistant to cryopreservation). Fresh semen was analyzed for sperm morphology by differential interference contrast microscopy (DIC), kinetic parameters by CASA and by plasma membrane integrity by epifluorescence microscopy. In post-freezing the samples were evaluated for kinetic parameters by CASA, sperm viability by flow cytometry (plasma and acrosomal membrane integrity, lipid peroxidation and active caspase) and plasma mebrane integrity by epifluorescence microscopy. Analysis of lipid profile were carried out by mass spectrometry MALDIMS of the sperm membrane lipids (Experiment 1) and from seminal plasma (Experiment 2). In Experiment 1 was observed difference in sperm lipid profile between the groups. The group A showed highest relative abundance of ions m/z 704.59; m/z 804.59 e m/z 943.77 on spermatozoa. In seminal plasma, here was a greater relative abundance of 34 lipid ions in bulls than group B. Therefore, in conclusion there are differences in the sperm lipid profile and seminal plasma lipid profile between sensitive or resistant bulls to semen cryopreservation.
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.unesp.br:11449/150787 |
| Date | 01 July 2016 |
| Creators | Zorzetto, Mariana Furtado [UNESP] |
| Contributors | Universidade Estadual Paulista (UNESP), Oba, Eunice [UNESP], Monteiro, Fábio Morato [UNESP], Papa, Frederico Ozanam [UNESP] |
| Publisher | Universidade Estadual Paulista (UNESP) |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | Unknown |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/doctoralThesis |
| Source | reponame:Repositório Institucional da UNESP, instname:Universidade Estadual Paulista, instacron:UNESP |
| Rights | info:eu-repo/semantics/openAccess |
| Relation | 600, 600, 600 |
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