(a) Effect of E2 administration on the number of Struts in 5 min. The columns and the vertical lines represent the mean±s.e.m. (n=5). (b) Effect of E2 administration on the number of Pecks in 5 min. The columns and the vertical lines represent the mean±s.e.m. (n=5). DOF=29, F=4.3, P=0.0059 by one-way ANOVA; *P<0.05, **P<0.01 versus vehicle, †P<0.05, ††P<0.01 versus 1 ng E2 by Fisher’s PLSD. (c) Effect of E2 administration on the number of Grabs in 5 min. The columns and the vertical lines represent the mean±s.e.m. (n=5). DOF=29, F=4.0, P=0.0093 by one-way ANOVA; *P<0.05 versus vehicle, ††P<0.01 versus 1 ng E2 by Fisher’s PLSD. (d) Effect of E2 administration on the number of Mounts in 5 min. The columns and the vertical lines represent the mean±s.e.m. (n=5). DOF=29, F=4.2, P=0.0071 by one-way ANOVA; *P<0.05 versus vehicle, ††P<0.01, †††P<0.001 versus 1 ng E2 by Fisher’s PLSD. (e) Effect of E2 administration on the number of CC-like actions in 5 min. The columns and the vertical lines represent the mean±s.e.m. (n=5). DOF=29, F=3.1, P=0.027 by one-way ANOVA; *P<0.05 versus vehicle, †P<0.05, ††P<0.01 versus 1 ng E2 by Fisher’s PLSD.