OU rats receiving progesterone were injected subcutaneously with 10 mg/kg progesterone (P8783, Sigma-Aldrich, Germany) diluted in propylene glycol daily for 2 weeks after OVX. Figure 8 shows the protocol of drug administration and surgery procedures. Animals that did not receive progesterone were injected with propylene glycol only (500 μl/kg). The chosen dose of progesterone was based on various studies37 (link),58 (link),59 (link). Plasma progesterone levels were measured using an ELISA kit (Immunotech, Russia).

Progesterone supplementation, experimental design.

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