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300
200
100
0
Generation
FIGURE 8.6
Duration of tonic immobility in lines of Japanese quail selected for long or short
duration of tonic immobility over 20 generations. (
&
) LTI, (
e
) CTI, (
x
) STI.
0.6
0.6
0.5
0.5
0.4
0.4
0.3
0.3
F0
F20-STI
0.2
0.2
0.1
0.1
Tl (s)
T
l (s)
0
0
0.6
0.5
0.4
0.3
F20-LTI
0.2
0.1
T
l (s)
0
FIGURE 8.7
Distributions of the duration of tonic immobility in lines of Japanese quail
selected for long or short duration of tonic immobility. The graph shows the distributions for the
F0 and F20 generations.
birds. The distribution of scores for the duration of TI in the first generation
was completely different from those in the 20th generation of the long
TI and short TI lines (
Figure 8.7
). Starting from the eighth generation
onwards, the standard deviations of the long TI and short TI lines ceased to
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