ANNUAL PERSISTENCY AND EGG PRODUCTION 



203 



8. M'inter production and persistency are rather signilicantly positively 

 correlated. 



9. Annual production is pronouncedly correlated with persistency. 



10. Persistency behaves as a trait much to be desired from the production 

 standpoint. 



References 



Cloodale, H. D. and Ruby Sanborn. 1922. Cluuiges in egg production in tiie 

 station flock. Mass. Agr. Expt. Sta. Bull. 211. 



Hays, F. A. 1924. Inbreeding the Rhode Island Red fowl with special refer- 

 ence to winter egg production. Amer. Nat. 58:43-59. 



Hays, F. A., Ruby Sanborn and L. L. James. 1924. Correlation studies on 

 winter fecundity. Mass. Agr. Expt. Sta. Bull. 220. 



Hays, F. A. and Ruby Sanborn. 1926a. Broodiness in relation to fecundity 

 in the domestic fowl. Mass. Agr. Expt. Sta. Tech. Bull. 7. 



Hays, F. A. and Ruby Sanborn. 1926b. Winter cycle and winter pause in re- 

 lation to winter and annual egg production. Mass. Agr. Expt. Sta. Tech. 

 Bull. 8. 



Hurst, C. C. 1923. Experiments in genetics, p. 490. Cambridge: Cambridge 

 University press. 



Punnett, R. C. 1923. Heredity in poultry. New York, London, etc.: Macmil- 

 lan and Co. 



Punnett, R. C. and P. G. Bailey. 1914. On inheritance of weight in poultry. 

 Jour. Genet. 4:23-39. 



