massachusetts 

 Agricultural Experiment Station 



BULLETIN NO. 220 NOVEMBER. 1924 



CORRELATION STUDIES ON 

 WINTER FECUNDITY 



By F. A. HAYS, RUBY SANBORN and L. L. JAMES 



In plant and animal breeding it is impossible to make or effect 

 changes in one character withont running the risk of profoundly modi- 

 fying, sometimes vmfavorably, other characters. Such is the common 

 experience of poultry breeders, abundantly confirmed by scientific 

 investigation. For this reason it is essential that the relation existing 

 between the major character in which improvement is sought, and 

 other characters with which it may be associated, be established. In 

 this report the results of such a study in poultry breeding are presented. 

 The bulletin is technical in its nature, and is addressed primarily to 

 those poultry breeders who are attempting to make thorough study of 

 the science on which their art is based. 



Request for Bulletins should be addressed to the 



AGRICULTURAL EXPERIMENTAL STATION 



AMHERST, MASS. 



