. California fish and game. Fisheries -- California; Game and game-birds -- California; Fishes -- California; Animal Population Groups; Pêches; Gibier; Poissons. 202 100 90 80 70 60 CALIFORNIA FISH AND GAME CONTROL ^=^ X \ X NX x lOppm DOT ^X^ l"1111^11^ DDT FED THROUGH EGG LAYING DDT STOPPED AT - START OF EGG LAYING IOppm-72% CONTROL-65% IOppm-64% 100 r*ss^- o o Id. 100 ppm- 66 % CONTROL-65% 100 ppm-61% 100 90 80 70 60 50 -^ x\ 500ppmD0T ^V N """â ⢠- ^N x x. x X. X \ x X X X x ^^â N X FERTILE HATCH 18 DAY CHICKS CONTROL-65% 500 ppm-60% 500 ppm-51% 4 6 DAY CHICKS FIGURE
. California fish and game. Fisheries -- California; Game and game-birds -- California; Fishes -- California; Animal Population Groups; Pêches; Gibier; Poissons. 202 100 90 80 70 60 CALIFORNIA FISH AND GAME CONTROL ^=^ X \ X NX x lOppm DOT ^X^ l"1111^11^ DDT FED THROUGH EGG LAYING DDT STOPPED AT - START OF EGG LAYING IOppm-72% CONTROL-65% IOppm-64% 100 r*ss^- o o Id. 100 ppm- 66 % CONTROL-65% 100 ppm-61% 100 90 80 70 60 50 -^ x\ 500ppmD0T ^V N """â ⢠- ^N x x. x X. X \ x X X X x ^^â N X FERTILE HATCH 18 DAY CHICKS CONTROL-65% 500 ppm-60% 500 ppm-51% 4 6 DAY CHICKS FIGURE 7. Reproductive success based on the production of 100 eggs by pheasants fed differ- ent DDT-contaminated diets. gratefully acknowledged. Frederick L. Delano, Fred J. Roth, and George Root, California Department of Agriculture conducted con- firmatory residue sample analyses. C. D. Ercegovich, Geigy Chemical Corporation, provided the DDT isomers used in residue analysis. Guidance in methods for inoculation of pheasant eggs was obtained From Ursula Abbott and Roger M. Craig, Department of Poultry Hus- bandry, University of California, Davis. The valuable assistance of the following Fish and Game personnel is acknowledged: Bruno Bellato, Kenneth E. Doty, Alfred Ferris, and Myron Al. Konntain for their part in Ihe incubation of eggs and care of the tesl birds; Oscar Brunetti for pathology investigations; Arthur I. Bischoff, Burton I). Collins, and Brian F. Hunter for preparation of samples for residue analysis and pathology examinations. Special thanks is given to Dolores E. Mora is for her assistance with the residue Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original California. Dept. of Fish and Game; California. Fish and Game Commission; California. Division of Fish and Game. [San Francisco, et
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