HROODIXESS AND FECUNDITY IX FOWL 



69 



The next two sections are devoted to tlie correlation lietween tiie presence 

 of broodiness and annual rate above the mean of broodies and non-broodies 

 combined, using the high broody flock of 1916 and tlie low broody flock of 1923. 

 Such a study shows the relative importance of liroodiness in determining- 

 annual rate in a flock of low and high fecundity. 



llf. Correlation Between the Presence of Broodiness and Annual Rate above 

 the Mean of Broodies and Non-broodies Combined — Pullet Year (Unimproved 

 Flock 1916). 



Totals 



324. 



49 



Coefficient of correlation 



.2480 ± .0328 



This constant agrees well with that for the whole eight-year i)eriod. It is 

 significant and illustrates the negative relation between broodiness and high 

 annual rate in an unimproved flock. 



iJ. Correlation Betxceen the Presence of Jiroodiness and Annual Rate above 

 the Mean of Broodies and Non-broodies Combined — Pullet Year (Improved 

 Flock 1923). 



Coefficient of correlation 



.2338 



.0308 



This coefficient does not differ significantly from the coefficient obtained on 

 the 1916 flock in section 14- or from tlie constant on all flocks in section 13. 

 Evidently the relation of broodiness to annual rate has not clianged witli the 

 improvement in fecundity. 



In the previous sections, the relation between times broodij and rate or 

 intensity of production has been considered. A considerable body of evidence 

 has been presented to indicate first, tliat hens with the liroody trait do tend 

 to lay more intensely during the winter season than non-liroody liens; second, 

 that broodiness is a considerable handicap to annual production in that it 

 lowers the annual rate. The next consideration is the relation of total days 

 broody during the pullet year to December rate, winter rate and annual rate. 



