TABLE B-57. —Duck production index, Michigan, 1964 and 1965 
Number per lineal mile 
Average 
Year 
Broods 
Hens and young 
Lone drakes 
brood size 
1964 
0.80 
5.83 
8.77 
5.76 
1965 
1.15 
8.22 
14.01 
6.11 
TABLE B-58. —Duck breeding population index, Michigan, 1964 and 1965 
Lineal miles 
Potential breeders per lineal mile 
Year 
i censused 
Wood duck 
All species 
1964 
137.4 
1.60 
17.09 
1965 
87.1 
1.36 
15.22 
TABLE B-59.—Waterfowl brood indexes, Wisconsin, 1964 and 1965 
Species 
Number 
of broods 
Number 
of young 
Average young 
per brood 
1964 
1965 
1964 
1965 
1964 
1965 
Mallard- 
62 
47 
420 
318 
6.8 
6.8 
Blue-winged teal-- 
23 
79 
155 
488 
6.7 
6.2 
Wood duck- 
36 
13 
232 
78 
6.4 
6.0 
Other species —- 
32 
21 
239 
144 
7.5 
6.9 
TABLE b- 60.—Wood duck broods observed by stream and age class, Indiana, 1965 
Stream 
Miles 
of 
transect 
Number of broods 
Total number 
of broods 
Percent change 
from 1964 
Age class 
I 
n 
m 
1964 
1965 
Maumee - -- 
15 
6 
6 
— 
9 
12 
+ 33 
Big Blue- 
12 
5 
3 
— 
2 
8 
+ 300 
Mascatatuck- 
19 
13 
19 
3 
6 
35 
+483 
Salt Creek- 
15 
9 
4 
2 
12 
15 
+ 25 
Total. 
61 
33 
32 
5 
29 
70 
+141 
83 
