File:California fish and game (20326235969).jpg

Title: California fish and game
Identifier: californiafishga34_4cali (find matches)
Year: [1] (s)
Authors: California. Dept. of Fish and Game; California. Fish and Game Commission; California. Division of Fish and Game
Subjects: Fisheries -- California; Game and game-birds -- California; Fishes -- California; Animal Population Groups; Pêches; Gibier; Poissons
Publisher: (San Francisco, etc. ) State of California, Resources Agency, Dept. of Fish and Game
Contributing Library: California Department of Fish and Game
Digitizing Sponsor: Internet Archive

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FERTILITY OF PHEASANT EGGS 213 found that the fertility dropped markedly the twenty-first day after sexual segregation (Figure 2a). I'revious to the noticeable drop in fer- tility on the twenty-first day, the fertility averaged 89.7 percent. Owing to the small number of hens involved and the lateness of the laying sea- son it was decided to repeat the experiment in subsequent years. Comparative fertility of eggs collected in 1947 is shown in Table 1. Only 13 dropped eggs were examined of which eight were fertile (61.5 percent). Fertility of eggs found in dump nests (92.8 percent) was slightly lower than that for destroyed nests (96.G percent) or for hatched nests (98.6 percent or higher). Sixty eggs from six abandoned nests were all fertile as were 81 eggs from nests found in mowed vetch fields. Nests found in mowed alfalfa fields included eggs from both dump nests and "going nests" (being incubated). Fertility averaged !>5.4 per- cent for the first cutting of alfalfa and 95.7 percent for the second cutting. The pre-nesting sex ratio in the areas in which nests were found varied from 59 cocks to 100 hens to 27 cocks to 100 hens. No difference was noted in fertility of eggs from areas of different cock-hen ratios. In both 1947 and 1948 no areas with a markedly unbalanced cock- hen ratio could be found; so the effect on fertility of a shortage of cocks
Text Appearing After Image:
May2l-3I ' June 1-21 April 24-30 May 1-31 T^MoyHI I April 2&50 Figure 7G. Fertile egg production of pheasant hens in a state game farm. Broken lines indicate days during which data were not secured, (a) Fertile egg production of eight pheasant hens segregated from cocks in 1946. (b) Fertile egg production of 24 pheasant hens segregated from cocks in 1947. A single cock was reintroduced with the hens the evening of May 24th. (c) The ri.se in fertility of eggs from 24 phea.sant hens after introduction of a single cock on April 25, 194S.

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