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Morphological characteristics of symmetrically developed ovaries observed in a 17-day incubated chicken embryo were analysed. The size and shape of the left and right ovaries were almost the same, but in histological analysis they have less developed cortex and many large lacunae in the medulla compared to a normal left ovary. The histological structure of both the left and right ovaries was, thus, incomplete compared with the normal left ovary, probably due to the effect of the right ovary developing similar to the left ovary without regression.