CROSSING PRODUCTION AND EXHIBITION BIRDS 15 



REFERENCES 



Hays, F. A., and Ruby Sanborn. 1924. The inheritance of fertility and hatch- 

 ability in poultry. Mass. Agr. Expt. Sta. Tech. Bui. 6. 



Hays, F. A. 1932. The relation of feather pigmentation to intensity of laying 

 in Rhode Island Reds. Mass. Agr. Expt. Sta. Bui. 288. 



Hays, F. A. 1933. Crossing production and exhibition Rhode Island Reds. 

 Amer. Nat. 67: 539-548. 



Warren, D. C, and C. D. Gordon. 1933. Plumage and eye color inheritance 

 in the single comb Rhode Island Red fowl. Jour. Agr. Research 

 47:897-910. 



