HHOODIXKSS AM) I'l-XIXDIT^ 1\ I'OWI. 



7:3 



XuiiiIht of liirds .... 

 .Mean total days broody 

 Total days broody standard (U'\ialion 

 .Mean annual rate .... 

 Annilal rate standard deviation 

 Coetticient of correlation 

 Regression broodlness on rate 

 Resrression rate on broodiness 



1122 



1-2.87 



=:2().8|. 



54..}».'J 



:^i).21. 



-..•J<i22 



—1.0526 



—.1246 



.0175 



A ratiier marked degree of negative correlation exists between days broody 

 and annual rate. The degree of broodiness influenees annual rate l)ecause of 

 the loss of time while broody. This constant agrees substantially with the con- 

 stant for times broody and annual rate (—.3232 ± .0180). 



Relatlitu of Broodiness lo ]\'iiifer Ihiie (dkI Annual Rote. 



In charts 1 and 2 the mean percentage of birds liroody on the different 

 .ears is illustrated gra])hica]ly by a solid line. The mean winter rate and 



fc 

 $ 



I 

 I 



■90 



PERCENT BPOOPy 



ME^N A^A/A/L/^L P^T5 



1916 1917 1918 19/9 /920 192/ /922 1923 

 Yf^R H//TCHEP 



CiiAur 2 Relation of percentage of birds broody to mean amiual rate by years. 



