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Letrozole is a non‐steroidal, third‐generation aromatase inhibitor used in humans. Although letrozole is not approved for use in animals, it is used off‐label in cases of synchronization and infertility. The aim of this study was to determine the pharmacokinetics of letrozole after a single intravenous administration at three different doses in ewes during the breeding season and its effect on gonadotropins...