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This is the first morpho‐histological comparison of guanaco ovaries between reproductive (long‐days) and non‐reproductive (short‐days) seasons, and oestrogen receptor‐alpha (ERα) and beta (ERβ) detection. Different stages of follicle development were found in the cortical area, but no corpus luteum was detected. The size and frequency of antral follicles and large atretic follicles were higher in...