1U{()(>I)I\KSS AM) Fl',( INDir^' IN I'OWI. 



()0 



'riie lu'xt two sections arc devoted to tlic correlation between the iiresenee 

 of liroodiness and annual rate above the mean of broodies and non-l)roodies 

 combined, using the high broody flock of 191(i and the low iiroody tlocl< of 192;}. 

 Such a study siiows tlie rehitive imi)ortanee of broodiness in determiniiifi- 

 annual rate in a flock of low and iiieh fecundilv. 



1.}. Correlation Between the Presence of Broodiness and Annual Rate above 

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

 Flock 1916). 



Annual Rate 



Broodv 



Non-Broody 



N'umber above population mean 



165 



31 



Number lielow population mean 

 Totals 



159 



18 



324. 



49 



Coeflicient of correlation — .24.80 ± .0328 



This constant agrees well with that for the whole eight-year period. It is 

 significant and illustrates the negative relation between broodiness and high 

 ■ innual rate in an unimp^o^■ed flock. 



IJ. Correlation Betxceen the Presence of Broodiness and .hniudl Rate above 

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

 Flock 1923). 



Coefficient of correlation — .2338 



.0308 



This coctficient does not difler significantly from the coefficient obtained on 

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

 Evidently the relation of broodiness to annual rate has not changed with the 

 improvement in fecundity. 



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

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

 has been presented to indicate first, that hens with the broody trait do tend 

 to lay more intensely during the winter season than non-broody hens; 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. 



