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Odagiri, K., Marumo, H., Matsuzawa, Y. et al. Changes in serum progesterone concentrations in ewes and mounting and sniffing behavior in rams during ewes' estrous cycle. J. Ethol. 14, 133–137 (1996). https://doi.org/10.1007/BF02348870
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DOI: https://doi.org/10.1007/BF02348870