RESUMO O objetivo deste trabalho foi caracterizar histologicamente o desenvolvimento ovariano pré-natal em fetos eqüinos sem raça definida (SRD) nos trópicos ABSTRACT This research research was aimed at histologically characterizing the pre-natal ovarian development of crossbreed equine fetuses in the tropics, observing the rise and the quantification of oogonia and follicles. One hundred and thirty one fetuses were obtained from a slaughterhouse, their crownrump length (CRL) was measured in centimeters (cm 1 and 12.0cm (60 to 69 GD); 23.1 and 29.0cm (116 to 135 GD); 50.1 and 65.0cm (201 to 245 GD) respectively. The maximum amount of oogonia and of primordial, growing and antral follicles occurred in fetuses whose CRL was between 4. 1 and 6.0cm (40 to 49 GD); 16.1 and 23.0cm (90 to 115 GD); 29.1 and 36.0cm (136 to 155 GD); 50.1 and 97.0cm (201 to 320 GD), respectively. These results suggest that the development of cross-breed equine ovarian fetuses in the tropics is more premature than that described in the literature on studies of various equine breeds in temperate regions.
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