Análise histométrica do desenvolvimento testicular de cutias (Dasyprocta aguti) criadas em cativeiros
Carregando...
Data
2003-01-01
Autores
Assis-Neto, Antônio Chaves de [UNESP]
Melo, Maria Isabel Vaz de
Carvalho, Maria Acelina Martins de
Miglino, Maria Angélica
Oliveira, Moacir Franco de
Título da Revista
ISSN da Revista
Título de Volume
Editor
Universidade de São Paulo (USP), Faculdade de Medicina Veterinária e Zootecnia (FMVZ)
Resumo
Foi estudado, por meio da histometria, o desenvolvimento testicular em 31 cutias da espécie Dasyprocta aguti desde o nascimento até 14 meses de idade. O diâmetro e a área, médios, foram obtidos a partir de 30 secções transversais de cordões e/ou túbulos seminíferos, em cada testículo, utilizando-se sistema de computadorizado de analises de imagem e uma ocular micrométrica Zeiss CPL 10X, acoplada a uma objetiva de 40X. As proporções volumétricas do testículo foram obtidas com o método estereométrico, segundo Elias, Henning e Schwartz¹. O diâmetro tubular médio apresentou crescimento lento desde o nascimento até os oito meses de idade, nas duas metodologias empregadas. Quando foi usada a ocular micrométrica observou-se que, a partir de nove meses, o diâmetro tubular teve um crescimento acelerado, chegando a duplicar o seu valor, se comparado com grupo etário que o antecedia. A proporção volumétrica dos cordões testiculares e túbulos seminíferos cresceu gradualmente, atingindo, aos nove meses, seu valor máximo (86,50%). As células de Leydig apresentaram proporção volumétrica decrescente, e seus maiores valores foram expressivos do nascimento até quatro meses de idade (7,00 ± 1,77% a 9,55 ± 0,64%) e mínimos a partir de nove meses, tendendo ainda a uma estabilização. O estroma diminuiu com a evolução da idade caindo bruscamente a partir da puberdade. Conclui-se que o diâmetro dos cordões testiculares e túbulos seminíferos apresentou maior crescimento, coincidindo com o início da puberdade e a proporção volumétrica das células de Leydig encontrou-se, respectivamente, mais alta e mais baixa no mesmo período.
The testicular development in 31 Agoutis, of the Dasyprocta aguti species, from the birth up to 14 months of age was studied through the histometric analysis. Mid diameter and the mean area, in each testicle, were obtained through 30 crosscuts of the funiculus and/or the seminiferous tubule, by means of a computerized system for image analysis and a Zeiss CPL 10X ocular micrometric device, coupled to an objective lens of 40X. Testicles volume proportions were obtained through the stereometric method, according to Elias, Henning and Schwartz¹. Tubule medium diameter presented a slow growth from the birth to the eight months of age, for both used methodologies. When the ocular micrometric device was used it was observed that, beginning in the ninth month, the tubule diameter had an accelerated growth getting to duplicate its value if compared with the preceded age group. The volume proportion of the testicle cord and the seminiferous tubule grew gradually, reaching its maximum value (86,50%) on the ninth month. The Leydig cells presented a decreasing volume proportion, and their largest values were expressive from the birth up to four months of age (7,00 ± 1,77% to 9,55 ± 0,64%) and a minimum value, starting from nine months, still tending to stabilize. The stroma decreased with the development of age and fall abruptly when the puberty starts. It is concluded that the diameter of the testicles cords and seminiferous tubule presented a larger growth coinciding with the start of puberty and the volume proportion of the Leydig cells was lower in the same period.
The testicular development in 31 Agoutis, of the Dasyprocta aguti species, from the birth up to 14 months of age was studied through the histometric analysis. Mid diameter and the mean area, in each testicle, were obtained through 30 crosscuts of the funiculus and/or the seminiferous tubule, by means of a computerized system for image analysis and a Zeiss CPL 10X ocular micrometric device, coupled to an objective lens of 40X. Testicles volume proportions were obtained through the stereometric method, according to Elias, Henning and Schwartz¹. Tubule medium diameter presented a slow growth from the birth to the eight months of age, for both used methodologies. When the ocular micrometric device was used it was observed that, beginning in the ninth month, the tubule diameter had an accelerated growth getting to duplicate its value if compared with the preceded age group. The volume proportion of the testicle cord and the seminiferous tubule grew gradually, reaching its maximum value (86,50%) on the ninth month. The Leydig cells presented a decreasing volume proportion, and their largest values were expressive from the birth up to four months of age (7,00 ± 1,77% to 9,55 ± 0,64%) and a minimum value, starting from nine months, still tending to stabilize. The stroma decreased with the development of age and fall abruptly when the puberty starts. It is concluded that the diameter of the testicles cords and seminiferous tubule presented a larger growth coinciding with the start of puberty and the volume proportion of the Leydig cells was lower in the same period.
Descrição
Palavras-chave
Cutia, Desenvolvimento pós-natal, Histometria, Testículo, Túbulo seminífero, Agouti, Postnatal development, Histometry, Testis, Seminiferous tubule
Como citar
Brazilian Journal of Veterinary Research and Animal Science. Faculdade de Medicina Veterinária e Zootecnia / Universidade de São Paulo, v. 40, n. 3, p. 202-208, 2003.