Vol. 8, No. 6 
Page 4 
Thus, juvenile bobwhite cocks had survival rates of 1-70. 1-58, and 1.82 times 
those of adult cocks on the Forbes, Dale, and Alma areas, respectively, for the 
winter period; that is, juvenile cocks survived about 1^-2 times as well as adult 
cocks. 
A dominance hierarchy, whereby adult cocks might be less vulnerable than 
juvenile cocks to capture by cock-and-hen traps, could be a source of bias in the 
May-June age ratio. However, adult cocks were captured throughout the trapping 
period as regularly as were juvenile cocks. 
Sample sizes for hens were insufficient for determining overwinter survival 
rates. 
Table 3- Age ratios (by sex) of bobwhites, obtained from fall harvests (November - 
December) and cock-and-hen trapping (May-June). Sample sizes are in parentheses. 
Cocks 
Hens 
Area 
Juvenile 
Adul t 
Juveni1e 
Adu 11 
Forbes 
1964 
November-December 
75.0(87) 
25-0(29) 
84.6(110) 
15-4(20) 
1965 
May-June 
83-6(56) 
16.4(11) 
80.0(4) 
20.0(1) 
Dale 
1964 
November-December 
84.2(80) 
15.8(15) 
88.8(95) 
11 .2(12) 
1965 
May-June 
89-4(59) 
10.6(7) 
100.0(4) 
0.0(0) 
Alma 
1964 
November-December 
78.6(11) 
21.4(3) 
72.2(13) 
27-8(5) 
1965 
May-June 
87-0(40) 
13.0(6) 
0.0(0) 
100.0(1) 
5 . Responses of Prairie Chickens to Hab ? tat Manipu1 at ion R. J. Ellis 
The numbers of prairie chickens on booming grounds on the Bogota Study Area 
in 1965 reached a peak about April 9 (Table 4). Corresponding dates in 1964 and 
1963 were April 9 and April 5, respectively. 
These data indicate that the peak of the booming season can be expected during 
the second week of April. Booming ground censuses should be conducted during this 
period. 
