ABSTRACT
El objetivo de este estudio fue describir la histología del hígado del chigüire (Hydrochoerus hydrochaeris). Para tal fin, se utilizaron 13 hígados de individuos adultos de ambos sexos, con un peso entre 33 y 50 kg de peso, los cuales fueron sacrificados en el Matadero- frigorífico de Pro-Fauna, localizado en el municipio de Iguape, estado de São Paulo y en el campus de la Universidad Federal de Viçosa, en el estado de minas Gerais, Brasil. Las muestras fueron fijadas en líquido de Bouin y en solución de formol al 10% v/v, y se procedió a realizar el procesamiento histológico de rutina. Para la visualización diferencial del tejido conjuntivo y de las fibras colágenas para la descripción general del tejido, se realizaron cortes de tejido de 4 µm, los cuales fueron coloreados posteriormente para su estudio histológico, utilizando las técnicas de coloración de hematoxilina & eosina, P.A.S. y Tricrómico de Gomori. Los resultados del estudio revelaron la presencia de un parénquima hepático y lobulillos, los cuales se encontraban próximos unos a otros, no existiendo delimitación marcada entre ellos. Los hepatocitos se encontraban agrupados en placas o hileras que se anastomosaban entre sí, y se disponían en una capa de células. Desde el punto de vista histológico, el parénquima hepático del Hydrochoerus hydrochaeris puede ser considerado como semejante en diversos aspectos, al de otros mamíferos.
The objective of the present study was to histologically describe the liver of the capybara (Hydrochoerus hydrochaeris). For that purpose, 13 livers of capybaras of both sexes, weighing between 33 and 50 kg, were used. The animals were slaughtered in the Pro-Fauna refrigerated slaughterhouse, located in Iguape, the State of São Paulo and in the campus of the Universidad Federal de Viçosa, the State of Minas Gerais, Brasil. Samples were fixed in Bouin and formalin solution (10% v/v) and a routine histological processing was made. For the differential visualization of the connective tissue and colagen fibers, and for the general description of the tissue, sections of tissues of 4 µm were made. Subsequently, tissue sections were stained with hematoxylin and eosin, P.A.S., and Gomori trichrome. The results of the study revealed the presence of a liver parenchyma and lobules, which were close to one another, without a marked delimitation among them. The hepatocytes were grouped in plates or rows which anastomosed with each other and were arranged in a layer of cells. From the histological standpoint, the liver parenchyma of the Hydrochoerus hydrochaeris can be considered similar in various aspects, to that of other mammals.
ABSTRACT
The objective of this study was to quantify argyrophillic, argentaffin and insulin immunoreactive endocrine cells in the different segments of the small intestine of Didelphis aurita and measure probable differences in the number of these cells between adult and post-pubertal animals. Biological material consisted of ten male and female opossums specimen, divided in two groups according to weigh. The utilized staining techniques were Grimelius, modified Masson-Fontana and direct immunoperoxidase. Results indicated a predominance of argyrophillic cells in the small intestine of opossums from class 1 and 2, with an average of 52.58 and 56.15 cells mm-2, respectively; of which, the average number of total endocrine cells, argyrophillic and argentaffin cells decreased distally in the intestinal segments of opossums from classes 1 and 2. No significant difference was observed for the insulin immunoreactive cells between the intestinal segments of animals from class 2. A greater number of insulin immunoreactive cells was encountered in the jejunum and ileum of animals from class 2 when compared to the same segment in animals from class 1.
The objective of this study was to quantify argyrophillic, argentaffin and insulin immunoreactive endocrine cells in the different segments of the small intestine of Didelphis aurita and measure probable differences in the number of these cells between adult and post-pubertal animals. Biological material consisted of ten male and female opossums specimen, divided in two groups according to weigh. The utilized staining techniques were Grimelius, modified Masson-Fontana and direct immunoperoxidase. Results indicated a predominance of argyrophillic cells in the small intestine of opossums from class 1 and 2, with an average of 52.58 and 56.15 cells mm-2, respectively; of which, the average number of total endocrine cells, argyrophillic and argentaffin cells decreased distally in the intestinal segments of opossums from classes 1 and 2. No significant difference was observed for the insulin immunoreactive cells between the intestinal segments of animals from class 2. A greater number of insulin immunoreactive cells was encountered in the jejunum and ileum of animals from class 2 when compared to the same segment in animals from class 1.
ABSTRACT
Visando o conhecimento da topografia do cone medular, foram dissecados cinco lobos guará ( Chrysocyon brachyurus)adultos, três machos e duas fêmeas, tendo sido verificado que o comprimento médio daquela porção da medula espinhal foide cerca de 6,5 em. A base do cone medular, formada pelo sexto segmento lombar da medula espinhal, mostrou-se apoiadasobre a terceira vértebra lombar (L3) e seu ápice, mais freqüentemente, sobre a quinta vértebra lombar (L5) ou, em igualproporção, sobre a junção entre a quinta e a sexta vé1iebras lombares, podendo ainda atingir a sexta daquelas vértebras (L6).O fundo de saco durai apresentou sua extremidade junto à margem caudal da sétima vértebra lombar (L7) ou próximo àmargem cranial da primeira vértebra sacra! (S1).
ABSTRACT
A capivara começou a ser explorada no Brasil nos últimos anos, visto sua facilidade de reprodução em cativeiro e alta prolificidade. Tais animais vivem em grupos com um macho dominante, várias fêmeas, indivíduos jovens e sub-adultos. Os machos possuem os testículos localizados subcutaneamente na região inguinal, um dos menores índices gonadossomáticos já registrados em um roedor e uma grande proporção volumétrica de células de Leydig, em comparação a outros animais. As fêmeas chegam à puberdade entre o 10o e 12o mês de idade, a duração do ciclo estral é de 7,5 + 1,2 dias e da gestação, 145 a 150 dias. Apesar de seu grande potencial zootécnico poucas pesquisas têm sido feitas com este animal e muitas perguntas sobre a fisiologia de sua reprodução ainda não foram respondidas.