. California fish and game. Fisheries -- California; Game and game-birds -- California; Fishes -- California; Animal Population Groups; Pêches; Gibier; Poissons. 284 CALIFORNIA FISH AND GAMF one group for 24 clays after the only male in the group died from DDT intoxication. This is the normal fertility carry-over period for pheasants (Twining, Hjersman, Macgregor, 1948). The overall hatching success of eggs ranged from 73.0 to 81.4 percent for the groups fed DDT, and was 77.3 percent for the controls. Differ- ences in hatching success between the control groups and groups fed DDT did not diff

• Contributor: Book Worm / Alamy Stock Photo
• Image ID: RG382C
• File size: 7.2 MB (160.1 KB Compressed download)
• Releases: Model - no | Property - no
• Dimensions: 2270 x 1101 px | 38.4 x 18.6 cm | 15.1 x 7.3 inches | 150dpi

More information

This image is a public domain image, which means either that copyright has expired in the image or the copyright holder has waived their copyright. Alamy charges you a fee for access to the high resolution copy of the image.

This image could have imperfections as it’s either historical or reportage.

. California fish and game. Fisheries -- California; Game and game-birds -- California; Fishes -- California; Animal Population Groups; Pêches; Gibier; Poissons. 284 CALIFORNIA FISH AND GAMF one group for 24 clays after the only male in the group died from DDT intoxication. This is the normal fertility carry-over period for pheasants (Twining, Hjersman, Macgregor, 1948). The overall hatching success of eggs ranged from 73.0 to 81.4 percent for the groups fed DDT, and was 77.3 percent for the controls. Differ- ences in hatching success between the control groups and groups fed DDT did not differ significantly at the 5 percent level (P > .05). However, there was significant lowering of hatching success from the first half of the laying period (77.3 percent) to the second half (G6.6 percent) for the group fed the 100 ppm diets through the egg-laying period (Figure 4). Hatching success for the first half of the laying period for control eggs was 75.7 percent, for the second half 84.6 per- cent. The group receiving the 100 ppm diet received the largest amount of DDT (about 350 mg) during the egg-laying period. >- < o CE LU a. UJ X (£ UJ Q. </) O o. 'â/ bus- ^^Sc^ /; ' / / IOO ppm / / 1.0 .8 .6 A .2 .0 1.0 .8 .6 .4 .2 31 7 MARCH - CONTROL DDTINFEEDTHROUGH EGG LAYING DDT IN FEED UNTIL START OF EGG LAYING / -*.- ^X Z^-^- r> I "â -. â7 ^^^ / >'/ t/ 500 ppm y 14 21 28 APRIL 12 19 26 MAY 3 4 5 6 LOT NUMBER FIGURE 3. Weekly egg production for pheasants on DDT contaminated diets.. 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 work.. California. Dept. of Fish and Game; California. Fish and Game Commission; California. Division of Fish and Game. [San Francisco, etc. ] State of California, Resources Agency, Dept. of Fish and Game