238 
Mallard Duck Brood Averages 
Year Class I Class [I Class III All No. of Broods 
1937 - 6.3 6.5 6.5 56 
1938 8.8 7.8 6.5 7.3 166 
1939 8.8 7.6 7.4 7.8 256 
1940 8.7 7.4 7.0 7.8 94 
1941 - 7.3 6.7 6.9 17 
1947 7.8 7.9 7.0 7.5 67 
1948 7.1 7.6 6.8 7.2 102 
1949 4.8 6.8 6.7 6.4 31 
1950 8.1 7.2 6.6 7.0 49 
1951 6.6 6.8 6.3 6.5 92 
1952 4.5 1.2 6.7 6.6 127 
The all-time average for Class III mallards is 6.9 ducklings per brood, so 
that the 1952 average is only slightly below this figure. A larger percentage of 
Class II and III broods were seen in 1952 than in 1951 due to the fact that the 
Chippewa area experienced a very early spring. The low brood average of Class I 
broods is possibly due to the very few broods seen and due to the fact that they 
consisted of the results of re-nesting attempts. 
Adult-Juvenile Ratios 
Adult-juvenile ratios for all species of ducks seen on the census can be 
compared to 1951 ratios as follows: 

1951 1952 
Species Adults Juveniles Ratio Adults Juveniles Ratio 
Mallard 312 993 1 to 3.2 194 863 . 1 to 4.4 
Baldpate 234 541 1 to 2.3 108 473 1 to 4.3 
Goldeneye 109 364 1 to 3.3 71 173 1 to 2.4 
B-w. teal 29 76 1 to 2.6 12 72 1 to 6.0 
Ringneck 22 40 1 to 1.8 17 25 1 to 1.4 
Wood duck 12 71 1 to 5.9 9 14 1 to 1.5 
All Others 21 9 1 to 0.4 83 78 1 to 0.9 
Total 739 2,094 1 to 2.8 494 1,698 1 to 3.4 
The ratios of juveniles to adults was considerably higher in 1952 which 
indicates a good breeding success for the spring breeding population. Ratios of 
adults to juveniles for all species each year of the census is as follows: 
1937 1938 1939 1940 1941 1947 1948 1949 1950 1951 1952 
1:3,.0 1:2.2 1:3.4 1:1.5 1:2.7 1:2.2 1:4.0 - 1:2.7 1:2.8 1:3.4 



From the above data we might conclude that the ratio of juveniles to adults 
in 1952 was above average. 
