GENETIC STUDIES IN POULTRY. 



227 



1924 and 1925. These data are not continuous throughout the 

 hatching season but represent only data secured at various inter- 

 vals during the hatching season. The record on any one hen, 

 however, is complete for the period in which the observations 

 were made. 



The sex ratio as used herein expresses the percentage of males 

 to females in the population. 



RESULTS. 



During the two years a grand total of 2,910 embryos and 

 living chickens was examined. Of these 1,488 were males and 

 1,422 females or a sex ratio of 51.13. The results of the two 

 years records are shown in Table I. 



TABLE I. 



THE TOTAL NUMBER OF MALES AND FEMALES OBSERVED AND THE SEX RATIO 

 FOUND IN THE CHICKS HATCHING AND IN THE DEAD EMBRYOS. 



It will be noted here that the sex ratio in each class, namely 

 > 3 , DS and living chicks, is over fifty, it being 55.82 in the D 3 , 

 50.06 in the DS and 50.97 in the living chicks. The results in 

 each of the two years are not in very close agreement although 

 the same general trend exists in each case. 



From the 2,910 individuals shown in Table I. a complete sex 

 ratio was secured on 2,266 chicks and embryos developing from 

 the eggs produced by 121 hens during the season of 1925. Of all 

 eggs used from this group of 121 hens and that developed beyond 

 the twelfth day of incubation, barring those chicks lost due to the 

 causes previously mentioned, a complete sex ratio was obtained 

 between the hatching dates of March 4 and May 6. These data 

 are shown in Table II. 



