Depression-like behaviors of Wistar (WIS) and Wistar Kyoto (WKY) female rats at P60 during diestrus (D1 + D2) and proestrus-estrus phases (P + E) of estrous cycle in FST. a Immobility duration. * Significant difference between WIS and WKY during proestrus-estrus phases (P + E) of estrous cycle, t = 2.956; p < 0.05. $ Significant difference in Wistar during diestrus (D1 + D2) and proestrus-estrus phase (P + E), t = 3.237; p < 0.05. b Latency to immobility. ** Significant difference between WIS and WKY during proestrus-estrus phases (P + E) of estrous cycle, p < 0.01, t = 3.799. $$$ Significant difference in Wistar during diestrus (D1 + D2) and proestrus-estrus phase (P + E), t = 8.342; p < 0.001. $$ Significant difference in WKYs during diestrus (D1 + D2) and proestrus-estrus phase (P + E), t = 3.716; p < 0.01.