Morphometric evaluation of the testis and spermatogenesis in adult oncelot (Leopardus pardalis, Linnaeus, 1758) / Avaliação morfométrica do testículo e da espermatogênese de jaguatiricas (Leopardus pardalis, Linnaeus, 1758) adultas

AUTOR(ES)
DATA DE PUBLICAÇÃO

2006

RESUMO

To study the spermatogenetic cycle in ocelots, were used, three adult males, proceeding from the Centro de Triagem de Animais Silvestres the Federal University of Viçosa and two adult males proceeding from the Fundação Zoobotânica of Belo Horizonte/MG/Brazil, authorized by the IBAMA-MG. These animals were submitted to general anesthesia, weighed and its testis were measured and biopsied to obtain, representative fragments. After this, the fragments histologically processed and analyzed in light microscopy. The average value for the age of the studied animals was 5.6 years and for the body weight was 14.5 kg. Using the volumetric calculation, it was observed a testicular mass 8.5 g. The gonadosomatic index was 0.12%, the tubulosomatic index was 0.074% and the leydigosomatic index was 0.0036%. In adult male ocelots, the testicular albuginea represents 23.42% of the testicular mass. The testicular parenchyma of adult ocelots is constituted by 80.58 % seminipherous tubules and 19.39% of intertubular tissue, with volume respective 10.53 e 2.58 ml. Most of the intertubular tissue is constituted by loose connective tissue. The mean diameter of the cross section of the seminipherous tubules in the adult ocelot was 211.37 m, while the average thickness of seminipherous tubules was 75.38 m. The adult ocelot presents around 17.81 m of seminipherous tubules for each gram of testis. The spermatogonias of the adult male ocelot possess a bigger coefficient of mitoses efficiency and the sperm production registered between the felines already studied. However, the Sertoli cells maintain its support capacity, in the same range observed for the felines. The spermatids reserve for each cycle of the seminipherous epithelium was approximately 3.7 billions for each gram of testis, the greatest quantity already registered between the studied mammals. The Leydig cell of ocelot presented a single, rounded nucleus with a fine layer of heterochromatin near to the nuclear envelope, and only one nucleolus. Too, it was observed a variable quantity of lipofuccin in its cytoplasm. The adult ocelot presents about 33.39 millions of Leydig cells in each gram of testis. In this animal, volume of the Leydig cells 913.39 m3. The ocelot presents a small volume of the Leydig cell but a similar number for each gram of testis as related to other studied felines.

ASSUNTO(S)

testis leopardus pardalis jaguatirica spermatogenesis oncelot testículos morphology leopardus pardalis morfologia espermatogênese reproducao animal

ACESSO AO ARTIGO

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