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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Avaliação da cisteína adicionada ao meio diluente sobre espermatozoides ovinos mantidos fresco, refrigerado e congelado / Evaluation of cysteine added to the extender on sperm sheep stored fresh, chilled and frozen

Corandin, Eduardo Mazon 30 August 2013 (has links)
Submitted by Luciana Ferreira (lucgeral@gmail.com) on 2014-09-25T13:58:14Z No. of bitstreams: 2 Corandin, Eduardo Mazon.pdf: 1586087 bytes, checksum: a88d04d645e03b0daee5a9fb5d261156 (MD5) license_rdf: 23148 bytes, checksum: 9da0b6dfac957114c6a7714714b86306 (MD5) / Approved for entry into archive by Luciana Ferreira (lucgeral@gmail.com) on 2014-09-26T11:16:12Z (GMT) No. of bitstreams: 2 Corandin, Eduardo Mazon.pdf: 1586087 bytes, checksum: a88d04d645e03b0daee5a9fb5d261156 (MD5) license_rdf: 23148 bytes, checksum: 9da0b6dfac957114c6a7714714b86306 (MD5) / Made available in DSpace on 2014-09-26T11:16:12Z (GMT). No. of bitstreams: 2 Corandin, Eduardo Mazon.pdf: 1586087 bytes, checksum: a88d04d645e03b0daee5a9fb5d261156 (MD5) license_rdf: 23148 bytes, checksum: 9da0b6dfac957114c6a7714714b86306 (MD5) Previous issue date: 2013-08-30 / Conselho Nacional de Pesquisa e Desenvolvimento Científico e Tecnológico - CNPq / The use of frozen semen is a practice still little spread among the sheep producers and shows pregnancy results unsatisfactory. Because this the addition of antioxidant in the extenders to improve the sperm quality after your handing is the goal of many researchers. Therefore, the aim of this study was to analyze in vitro effects of different concentrations of cysteine anti-oxidant in extenders on the sheep sperm storage fresh, cooled and frozen. After sperm sampling and the individual analysis, the semen of six-sheep were pooled and divided in equal aliquots to be diluted in PBS (fresh semen), Equimix® (cooled semen) or Bovimix® (frozen semen). For each of these groups were added cysteine in different concentrations 0, 2.5, 5.0 and 7.5 mM, so were made the respective experimental groups Control, Cys2.5, Cys5.0 and Cys7.5. The fresh semen was stored in room temperature during two hours, the cooled semen was stored among four to eight hours in 16ºC and the frozen semen was stored into liquid nitrogen. The analyzed variables to the fresh and cooled semen were motility, vigor, viability and mitochondrial potential of the spermatozoids. To the frozen semen, the parameters evaluated were the plasmatic and acrossomal membranes integrity, kinect by the computer system (CASA) and the mitochondrial potential. The group Cys7.5 showed the highest values of motility in the fresh semen (73.50%), however there was not different (p>0.05) than the group Cys5.0 in the cooled semen after four (68.00 vs 66.50%) and eight hours (57.00 vs 55.00%). For the frozen semen, the addition of 7.5 mM cysteine promoted the highest percentage of spermatozoids with integrate plasmatic membrane (23.2%), followed by the Cys5.0 group (20.0%), however there was not statistic different (p<0.05) among the group in the acrosomal integrity. The addition of cysteine in the frozen extender promoted increased in the capacity of mobility to the spermatozoa. There was not difference (p>0.05) among the groups Cys5.0 and Cys7.5 mM for the variables average-path (VAP), straight-line (VSL) and curvilinear velocity (VCL), however the concentration of 7.5 mM cysteine was more efficient in the protection of plasmatic membrane and increased the beat/cross frequency (BCF). / O uso de sêmen conservado é uma prática pouco difundida na ovinocultura nacional, e ainda apresenta resultados insatisfatórios de prenhez. Por isso, a adição de antioxidantes aos diluidores para preservar a qualidade seminal após sua manipulação tem sido alvo de muitas pesquisas. Sendo assim, objetivou-se avaliar o efeito in vitro da adição de diferentes concentrações do antioxidante cisteína ao meio diluente no sêmen ovino mantido fresco, refrigerado e congelado. Após a colheita e análise individual, o sêmen de seis carneiros formaram um pool, iguais alíquotas deste foram diluídas em PBS (sêmen fresco), Equimix® (sêmen refrigerado) ou Bovimix® (sêmen congelado), e adicionado 0, 2.5, 5.0 e 7.5 mM de cisteína para formar os respectivos grupos experimentais: Controle, Cys2.5, Cys5.0 e Cys7.5. O sêmen fresco foi mantido em temperatura ambiente durante duas horas, o sêmen refrigerado permaneceu durante quatro e oito horas à 16°C e o sêmen congelado foi armazenado em nitrogênio líquido. As variáveis analisadas do sêmen fresco e refrigerado foram motilidade, vigor, viabilidade e potencial mitocondrial dos espermatozoides. Avaliaram-se no sêmen congelado a integridade de membrana plasmática e acrossomal, cinética espermática computadorizada e potencial mitocondrial. O grupo Cys7.5 apresentou os maiores valores de motilidade no sêmen fresco (73,50%), porém não diferiu (p>0,05) com o grupo Cys5.0 no sêmen refrigerado após quatro (68,00 vs 66,50%) e oito horas (57,00 vs 55,00%). No sêmen congelado, a adição de 7.5 mM de cisteína promoveu maior porcentagem de espermatozoides com a membrana plasmática íntegra (23,2%), seguido pelo grupo Cys5.0 (20,0%), más não houve diferença estatística (p>0,05) entre os grupos na integridade acrossomal. A adição de cisteína ao diluente de congelação promoveu aumento na capacidade de deslocamento dos espermatozoides. Não houve diferença (p>0,05) entre os grupos Cys5.0 e Cys7.5 para as variáveis velocidade de trajeto (VAP), velocidade retilínea (VSL) e velocidade curvilínea (VCL), porém a concentração de 7.5 mM de cisteína foi mais eficiente na proteção da membrana plasmática e promoveu maior frequência de batimento flagelar (BCF).

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