l!)i TKCHNICAI, HUI.LKTIN 11 



12. Annual rate of laying is not affected by date of hatching. 



13. Annual rate is but very sliglitly correlated with age at first egg 

 in a negative direction. 



l-i. Annual rate .shows but a small negative correlation with bod\" 

 weight at first egg. 



15. Annual rate is most intimately correlated with annual egg record, 

 the constant being +.7106 ±:.0066 for the population studied. 



16. Annual rate is valueless for prediction purposes during the pullet 

 year and is l)ut a gross approximation of rate for the entire pullet laying 

 year. 



17. Age at first egg and degree of broodiness are independent. 



IH. A positive correlation between total days broody and mean winter 

 clutch size suggests that birds carrying factors for broodiness show a 

 tendency to lay in larger clutches during winter than do non-broody birds 

 The degree of correlation, however, is not sufficient to indicate that non- 

 broody birds may not carry high intensity. 



1J». In general, intensity or rate has been shown to vitally aft'ect fecund- 

 ity; and as a short-time measure of intensity, mean winter clutch size ha.s 

 been suggested because it is definitely measurable and because it is in- 

 herited. 



REFERENCES 



Goodale, H. D. 1918. Internal factors influencing egg production in th'' 

 Rhode Island Red breed of domestic fowl. Amer. Nat. 52:65-321. 



Goodale, H. D., and Ruby Sanborn. 1922. Changes in egg production in 

 the Station flock. Mass. Agr. Expt. Sta. Bnl. 211. 



Harris, J. Arthur, and H. D. Goodale. 1922. The correlation between tiie 

 egg production of the various periods of the year in the Rhode Island 

 Red breed of domestic fowl. Genetics 7:446-465. 



Hays, 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 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. Bui. 220. 



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

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



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

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

 Bui. 9. 



Pearl, Raynmnd, and Frank M. Surface. 1909. Poultry Notes. Maine Agr. 

 Expt. Sta. Bui. 165. 



Punnett, R. C. 1923. Heredity in Poultry. New York, London, etc.: Mac- 

 millan and Co. 



Riddle, Oscar. 1925. Studies on tlie plnsiology of reproduction in birds. 

 Amer. Jour. Phisiol. 73:15-16. 



