204 TECHNICAL BULLETIN 12 



11. Age at first egg and annual production are independent. 



12. Length of winter pause and annual production are negatively correlated 

 in an important degree. 



13. "Winter clutch size and annual production are positively correlated in 

 about the same degree as days broody and annual production are negative- 

 ly correlated. 



14. Total days broody and annual production are negatively correlated and 

 days broody is of about the same importance as length of winter pause 

 and clutch size in relation to production. 



13. Annual persistency and annual production are verj- intimately correlated 

 with each other. The degree of correlation places persistency as the most 

 important cliaracteristic affecting fecundity in the flocks studied. 



16. The multiple correlation of age at first egg, length of pause, winter clutcli 

 size, days broody, and persistency witli annual egg record is -\-.86-i2. 



Literature Cited 



Hay.s, F. A. and J. S. Bennett. 1923. Correlation of sexual maturity to annual 

 egg record. Poultry Science II, No. 6:205 — 206. 



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

 ference to winter egg production. Amer. Nat. 58: 43 — 59. 



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

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



Hays, F. A. and Ruby Sanborn. 19261). AVinter cycle and winter pause in 

 relation to winter and annual egg production. Mass. Agr. Expt. Sta. 

 Tech. Bui. 8. 



Hays, F. A. and Ruby Sanborn. 1926c. Annual persistency in relation to 

 winter and annual egg production. Mass. Agr. Expt. Sta. Tech. Bui. 9. 



Hays, F. A. and Ruby Sanborn. 1927. Intensity or rate of laying in relation 

 to fecundity. Mass. Agr. Expt. Sta. Tech. Bui. 11. 



Hays, F. A. 1927. Inheritance of persistency and its relation to fecundity. 

 Proc. World's Poultry Congress. 



3500 l-'28. No. lOi; 



