. California fish and game. Fisheries -- California; Game and game-birds -- California; Fishes -- California; Animal Population Groups; Pêches; Gibier; Poissons. PHEASANT POPULATIONS IN THE SACRAMENTO VALLEY 167 15 < bJ Q O z O t- z ai o or UJ a. 1949 1948 JUNE JULY AUG SEPT. ' OCT. BY DATE OF RELEASE NOV. 15 < UJ Q O UJ o <r UJ 1949 1948 8 10 12 14 Figure 86. BY AGE IN WEEKS AT TIME OF RELEASE Known mortality of game farm birds soon after release on Sartain Ranch on different dates and at various ages. August releases of both 1948 and 1949 appear to be subjected to greater mortal
. California fish and game. Fisheries -- California; Game and game-birds -- California; Fishes -- California; Animal Population Groups; Pêches; Gibier; Poissons. PHEASANT POPULATIONS IN THE SACRAMENTO VALLEY 167 15 < bJ Q O z O t- z ai o or UJ a. 1949 1948 JUNE JULY AUG SEPT. ' OCT. BY DATE OF RELEASE NOV. 15 < UJ Q O UJ o <r UJ 1949 1948 8 10 12 14 Figure 86. BY AGE IN WEEKS AT TIME OF RELEASE Known mortality of game farm birds soon after release on Sartain Ranch on different dates and at various ages. August releases of both 1948 and 1949 appear to be subjected to greater mortality than those of any other single release. This is further reflected in fewer hunting season returns from these releases (Figure 87). There appears to be a relation between ages of birds at release and subsequent mortality. In general, more birds of younger age classes were found dead than of older classes, perhaps because older birds disperse more readily. Younger birds (6 to 10 weeks old) were found flocked even after several weeks in the field. This increased the possibility of a single predator killing a large number. Releasing birds in small groups throughout the area to be stocked may reduce the possibility of large number of birds being killed while they are concentrated near releasing 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, etc. ] State of California, Resources Agency, Dept. of Fish and Game
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