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Biol Bull 56: 226-233. (March 1929)
© 1929 Marine Biological Laboratory
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FURTHER STUDIES ON THE SEX RATIO IN THE CHICKEN

W. V. LAMBERT and V. CURTIS

1. The sex ratio for a total of 2,501 chicks and dead embryos examined from April 11 to July 17, 1928, was 46.82 ± 0.67. This represents the sex ratio upon 84.35 per cent. of all fertile eggs set during this period.

2. The sex ratio observed for dead embryos alone was 47.36 ± 1.29 and for chicks alone it was 46.61 ± 0.79.

3. Evidence is presented to show that there is not a selective mortality against one sex previous to the time of hatching.

4. No definite tendency of the sex ratio to increase or decrease was observed during the hatching season.

5. Separate tabulations for the sex ratio upon eleven colony matings, one male with several females in a colony, did not show significant differences between the colonies that might be traceable to individual differences.

6. No significant differences for the sex ratio of hens of different ages were noted.

7. Egg production for the three months immediately preceding the hatching season, or egg production during the hatching season did not influence the sex ratio. The respective correlation coefficients were -.05 ± 0.19 and .09 ± 0.13.






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Copyright © 1929 by the Marine Biological Laboratory.