A comparison between brood sizes in Age Claes I for the blue-winged teal 
ist &leo interesting and gives tome clue ase to the number of efes per clutch in 
re-oeeting attempts ae compared te Initial attempts. 
Age Cleese 1 Arerage Number of Ducklings per Brood 
June 80 July 14 July 27 Auguet 12 
Blue-winged teal 9.16 S75 5.28 7,00 
Table &. -= Erood Averazes by Age Olasseg 
Harth and South Dekoeta 
(Figures in parenthesis indicate number of Sraods seen). 
Age Clacg J245" 346" Lg4o*" 1595 S"4 
I #61 E.11 f.93 760 
Blue-winged II 7.13 Boe 7,77 7, °G 
teal IIL #00 7.32 7.42 7.70 
All 2.21 (233) 7.98 (250) #.80 (406) 7.65 (171) 
I 7.15 7.48 9.26 6.48 
II 6.47 7.15 6,95 5.66 
Mallard Il 6.66 6.89 6.74 6.57 
All 6.80 (141) 7.10 (77) 7.64 (81) 6,47 (49) 
z 3.30 66 &,08 744 
II @ 26 ? 83 7.07 7.64 
Gadwall ITI Z 7,83 7,11 - 
All $.50 (34) #£.16 (48) 7.73 (102) 7.65 (40) 
I 7.66 Fl gp Bi, 84 5,52 
7 Ii 6.50 7.00 5.2? 4,82 
intall I1l 5.71 5.57 5.68 5.68 
All 6.52 (71) 6.54 (37) 5,87 (55) 5.38 (78) 
I 7.57 772 7 O77 6.65 
II 9.14 7. 3o. 7.28 6.00 
Shayeler II 8.35 6.26 6.40 6.66 
All g.62 (27) 7.83 (27) 7.86 (25) 6.40 (37) 
" Northeastern South Dakota and Seuthesatern North Dakote. 
*? €6SNortheasternm South Dakota. 
ee™ Worth Daketa, east of Missouri Hirer. 
One of the interesting featuree of Table # is the similarity in breed 
areragea between yeare, Thies is especially true in Clasa ITIL breede for the 
mallard and pintail and in the "ALL" age greup for the blue-wing. In fact none 
of the arerages vary ¢nough to cause violent fluctuations in the production 
from year to year. 
In conclusion, we might add that for the Dakota region in general the 
blue-winged teal appears to be the most successful breeding duck beth from the 
atandpoint of number cf ducklings produced per brood and number of braode pre- 
duced per breeding pair. Thie latter peint was revealed from intensive etudy 
152 
