Birth of normal calves after artificial insemination using cryopreserved spermatozoa obtained from refrigerated epididymides of death bovine/Nascimento de bezerros normais apos inseminacao artificial utilizando espermatozoides criopreservados obtidos de epididimos refrigerados de bovinos apos a morte
The objective of this study was to evaluate the morphological and functional characteristics of bovine spermatozoa retrieved from chilled epidydimides for long periods and cryopreserved. Bovine testicles were collected in abattoir, transported to the laboratory and stored at 5[degrees]C for 0, 24, 4...
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Published in: | Ciência rural Vol. 41; no. 5; p. 869 |
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Universidade Federal de Santa Maria
01-05-2011
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Abstract | The objective of this study was to evaluate the morphological and functional characteristics of bovine spermatozoa retrieved from chilled epidydimides for long periods and cryopreserved. Bovine testicles were collected in abattoir, transported to the laboratory and stored at 5[degrees]C for 0, 24, 48h e 72 hours (n=10 for each storage time treatment group). The spermatozoa were retrieved from each epidydimides, evaluated and diluted in tris-egg yolk-glycerol 7[degrees]%o medium and cryopreserved in liquid nitrogen. The morphological and functional characteristics of the spermatozoa were analyzed in vitro, by microscopic evaluation and in vivo, using artificial insemination. Morphological alterations as sperm immaturity and motility reduction decreased after 72h of epididymides refrigeration and after thaw sperm were observed. The membrane and acrosome integrity were only affected in G48 and G72 groups after cryopreservation. However, the sperm capacity of fertilization postcryopreservation was sufficient to promote two pregnancies and birth of healthy calves from G24 h and G72h groups. These results indicated that recovery and cryopreservation of chilled epididymal sperm until 72h from dead animals is a viable option to preserve male gametes to compose a germplasm bank. Key words: dead animals, biotechnology, germplasm. O objetivo deste estudo foi avaliar as caracteristicas morfologicas e funcionais dos espermatozoides bovinos recuperados de epididimos resfriados por longos periodos e posteriormente criopreservados. Testiculos bovinos foram coletados no abatedouro, transportados ao laboratorio e armazenados a 5[degrees]C por 0, 24, 48 e 72 horas (n = 10 para cada tratamento). Os espermatozoides foram extraidos de cada epididimo, avaliados e diluidos em meio tris-gema-glicerol a 7% e criopreservados em nitrogenio liquido. As caracteristicas morfologicas e funcionais dos espermatozoides foram avaliadas in vitro por analise microscopica e in vivo, por meio de inseminacao artificial. Foram observadas alteracoes morfologicas caracteristicas da imaturidade dos espermatozoides e reducao da motilidade apos 72 horas de refrigeracao dos epididimos. Esses parametros tambem foram alterados apos o descongelamento, em todos os tratamentos. A manutencao dos espermatozoides a 5[degrees]C por 72h reduziu a motilidade espermatica. Em todos os tratamentos foram observadas alteracoes morfologicas caracteristicas da imaturidade dos espermatozoides e reducao da motilidade apos o descongelamento. A integridade de membrana plasmatica e acrossoma somente foram afetadas pos criopreservacao nos grupos mantidos a 5[degrees]C durante 48 ou 72h antes da criopreservacao. Contudo, a capacidade de fecundacao dos espermatozoides mantidos a 5[degrees]C durante 24 ou 72h antes da criopreservacao foi suficiente para promover duas gestacoes e nascimento de bezerros saudaveis. Esses resultados indicam que a recuperacao e a criopreservacao de espermatozoides obtidos de epididimos mantidos a 5[degrees]C, ate 72h, provenientes de animais mortos e uma opcao viavel para preservar gametas masculinos para compor um banco de germoplasma. Palavras-chave: animais mortos, biotecnologia, germoplasma. |
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AbstractList | The objective of this study was to evaluate the morphological and functional characteristics of bovine spermatozoa retrieved from chilled epidydimides for long periods and cryopreserved. Bovine testicles were collected in abattoir, transported to the laboratory and stored at 5[degrees]C for 0, 24, 48h e 72 hours (n=10 for each storage time treatment group). The spermatozoa were retrieved from each epidydimides, evaluated and diluted in tris-egg yolk-glycerol 7[degrees]%o medium and cryopreserved in liquid nitrogen. The morphological and functional characteristics of the spermatozoa were analyzed in vitro, by microscopic evaluation and in vivo, using artificial insemination. Morphological alterations as sperm immaturity and motility reduction decreased after 72h of epididymides refrigeration and after thaw sperm were observed. The membrane and acrosome integrity were only affected in G48 and G72 groups after cryopreservation. However, the sperm capacity of fertilization postcryopreservation was sufficient to promote two pregnancies and birth of healthy calves from G24 h and G72h groups. These results indicated that recovery and cryopreservation of chilled epididymal sperm until 72h from dead animals is a viable option to preserve male gametes to compose a germplasm bank. The objective of this study was to evaluate the morphological and functional characteristics of bovine spermatozoa retrieved from chilled epidydimides for long periods and cryopreserved. Bovine testicles were collected in abattoir, transported to the laboratory and stored at 5[degrees]C for 0, 24, 48h e 72 hours (n=10 for each storage time treatment group). The spermatozoa were retrieved from each epidydimides, evaluated and diluted in tris-egg yolk-glycerol 7[degrees]%o medium and cryopreserved in liquid nitrogen. The morphological and functional characteristics of the spermatozoa were analyzed in vitro, by microscopic evaluation and in vivo, using artificial insemination. Morphological alterations as sperm immaturity and motility reduction decreased after 72h of epididymides refrigeration and after thaw sperm were observed. The membrane and acrosome integrity were only affected in G48 and G72 groups after cryopreservation. However, the sperm capacity of fertilization postcryopreservation was sufficient to promote two pregnancies and birth of healthy calves from G24 h and G72h groups. These results indicated that recovery and cryopreservation of chilled epididymal sperm until 72h from dead animals is a viable option to preserve male gametes to compose a germplasm bank. Key words: dead animals, biotechnology, germplasm. O objetivo deste estudo foi avaliar as caracteristicas morfologicas e funcionais dos espermatozoides bovinos recuperados de epididimos resfriados por longos periodos e posteriormente criopreservados. Testiculos bovinos foram coletados no abatedouro, transportados ao laboratorio e armazenados a 5[degrees]C por 0, 24, 48 e 72 horas (n = 10 para cada tratamento). Os espermatozoides foram extraidos de cada epididimo, avaliados e diluidos em meio tris-gema-glicerol a 7% e criopreservados em nitrogenio liquido. As caracteristicas morfologicas e funcionais dos espermatozoides foram avaliadas in vitro por analise microscopica e in vivo, por meio de inseminacao artificial. Foram observadas alteracoes morfologicas caracteristicas da imaturidade dos espermatozoides e reducao da motilidade apos 72 horas de refrigeracao dos epididimos. Esses parametros tambem foram alterados apos o descongelamento, em todos os tratamentos. A manutencao dos espermatozoides a 5[degrees]C por 72h reduziu a motilidade espermatica. Em todos os tratamentos foram observadas alteracoes morfologicas caracteristicas da imaturidade dos espermatozoides e reducao da motilidade apos o descongelamento. A integridade de membrana plasmatica e acrossoma somente foram afetadas pos criopreservacao nos grupos mantidos a 5[degrees]C durante 48 ou 72h antes da criopreservacao. Contudo, a capacidade de fecundacao dos espermatozoides mantidos a 5[degrees]C durante 24 ou 72h antes da criopreservacao foi suficiente para promover duas gestacoes e nascimento de bezerros saudaveis. Esses resultados indicam que a recuperacao e a criopreservacao de espermatozoides obtidos de epididimos mantidos a 5[degrees]C, ate 72h, provenientes de animais mortos e uma opcao viavel para preservar gametas masculinos para compor um banco de germoplasma. Palavras-chave: animais mortos, biotecnologia, germoplasma. |
Audience | Academic |
Author | Franco, Vanessa de Oliveira Ma Campos, Haroldo da Costa Ferreira Sereno, Jose Robson Bezerra Rezende, Luiz Osvaldo Fonseca Costa, Priscila de Melo |
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Title | Birth of normal calves after artificial insemination using cryopreserved spermatozoa obtained from refrigerated epididymides of death bovine/Nascimento de bezerros normais apos inseminacao artificial utilizando espermatozoides criopreservados obtidos de epididimos refrigerados de bovinos apos a morte |
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