TABLE F-38, --Average brood size and age-class distribution of duck broods, 
Chippewa National Forest, Minnesota, 1937-63 




Class II Class III Average 






1937-~--=-------------------- -- 6.3 6.5 6.5 56 
ORO eee d ee eee hae 8.8 7.8 6.5 7.3 166 
TOR9 a eceeas tank kasha osess 8.8 ems 7.4 7-8 256 
TGUG ase eh Be Phe Be 3 8.7 Tit 7.0 7.8 gh 
Fife Eanes me eye ee - 7.3 6.7 6.9 17 
TON, pe ae oe ER pete 7.8 7.9 7.0 75 67 
1G) ee ae ee ee a Tol 7.6 6.8 7.2 102 
TAGs s aneemaasteennahebenene 4.8 6.8 6.7 6.4 31 
195 Gann Hee e ane enn 8.1 7.2 6.6 T.0 kg 
as aap ae me rte fee ered onan 6.6 6.8 653 6.5 92 
TOG Seah dawwente ele aaa 4.5 7.2 6.7 6.6 127 
195 Gacuane sachet see ae segn ser 7-5 5.7 5-6 5.9 18 
1954 ee ee ee ee ee eee ee eee 7.8 7.0 5.5 6.6 kh 
1955 ------------------------- T-0 T-1 T-O 7.0 a1 
chet ( Oe a ie Wd Seal Ss 6.9 6.7 6.9 6.8 63 
IO Tasee eran ere eeeriese cers -- 6.4 7.4 7.0 2h 
JOGGeas nek top ens oee See eS 6.8 7.3 7.3 7.2 63 
1950 -f i cheneene win eutad eee 4.6 6.6 Tel 6.5 55 
EGG Oper ie oe th fae ele 7.2 6.5 6.2 6.6 92 
TOG 1 -onme tee Ss edoe eee abs 5.7 6.5 6.1 6.3 90 
TOGO s Memeo Be Ber 7.2 7.9 4.0 6.5 23 
1963 we ee eee 5.5 6.6 6.8 6.4 72 
percent of Rotal-=v-veve = : a 
TABLE F-39, --Duck production ratios, Chippewa National Forest, Minnesota, 1962-63 


1962 1963 
Mallard----------------- : 730 1:1.9 
American widgeon-------- 127 1:2.3 
Blue-winged teal-------- 186 1:4.7 
Wood duck------+--------- 204 1:3.1 
Ring-necked duck-------- 30 1:3.7 
Goldeneye--------------- 214 1:6.7 
Other--~---------------- 39 1:5.0 
TABLE F-40,--Duck production indexes, Michigan, 1951-63 
Number per lineal mile 
Average brood size 
Year Hens and young | Lone drakes 
165) Ape oee ened n eee eee 3.31 5.76 
fe pa en A a a 3.21 4.60 
1959 o--- Seeds eenieotsaethasn 4.32 6.10 
1 oe ee ae 4.60 6.24 
[O55 Spade onward tenes ae 5.09 6.28 
OGG x wi eee rae aly ina ile, 4LO 5.86 
POS fescue soles. ate dee eases 4.80 5.10 
1958------------------+-.---- 6.50 2°97 
1959---------~--------------- 12.58 5 06 
es Gene ie -ce an a  N  Y  o 14.49 6.50 
DOG Leeceetei reread an abel Te tL 5 64 
1060-33 p nena eee sees 8.48 5.60 
Ne cp een np ep ae cee pe 6.06 5035 
