Figure 9

Duration of fertility after a single artificial insemination (AI) with pooled Muscovy semen of selected (1997, 2001 and 2005) and control (2005) Brown Tsaiya lines. Solid lines for 2005 represent the functions of logistic curves. y(x) = 91.90 (1+e^{-0.7874(10.745-x)})^-1 for the selected line(S2005) and y(x) = 91.25 (1+e^{-0.6797(6.489-x)})^-1 for the control line(C2005).