TABLE B-40.--Duck broods by age class, mid-July, 
North Dakota, 1955 to 1965 
Age class 1 
Average 
Percent of total 
1955-1964 
1964 
1965 
Class I: 
la- 
24.1 
20.0 
11.1 
lb —. 
20.5 
12.5 
24.1 
Ic.. 
16.8 
25.0 
11.1 
Total- 
61.4 
57.5 
46.3 
Class II: 
Ha.-.. 
13.3 
7.5 
18.5 
Hb.. 
9.4 
7.5 
13.0 
He .. 
10.6 
20.0 
7.4 
Total. 
33.3 
35.0 
38.9 
Class HI:- 
5.3 
7.5 
14.8 
* Based on "A guide for Aging Duck Broods in the Field, " by Gallop and 
Marshall, May, 1954. 
TABLE B-41. --Statewide aerial breeding population index, 
Nebraska, 1964 and 1965 
Species 
1965 
1964 
Percent change 
Ducks 
Dabblers: 
Mallard- 
36, 000 
69, 600 
-47 
Gadwall- 
2,300 
3,400 
-32 
Widgeon - 
— 
700 
— 
Green-winged teal — 
200 
-- 
Blue-winged teal --- 
10, 600 
22,200 
-52 
Shoveler- 
2, 700 
5, 600 
-52 
Pintail- 
6,100 
22,100 
-72 
Subtotal- 
58, 700 
123,600 
-53 
Divers: 
Redhead- 
100 
4, 600 
-98 
Canvasback- 
1,300 
2, 500 
-48 
Scaup - 
1, 000 
5, 800 
-83 
Ruddy duck- 
-- 
900 
— 
Subtotal- 
2,400 
13, 800 
-82 
Total- 
61,100 
137,400 
-56 
70 
