\9() TEC'HN'ICA[. I'.l'I.I.KTIX 11 



!l i.s possible that aniuuil ratf mi.iilit lie iiUTt-ased hv proper inctlidds of 

 breeding. 



The eoerticieiit of corri'lalion Ix'twcen liatchiiiii (late and annual rate is 

 of very small magnitude and not statistieaJly signitieant. it can on]\ 1) ■ 

 interpreted as meaning tliat annual rate is indei)endeiit of hatching date. 



1-t. CorrehitUnt Heticeeii .li/i "/ l-lr.s-/ l'-'j;i "ii</ .liiininl liith-. 



Age at first egg was sliown in section •") to be signiru-antiy correlated 

 with winter ehitch si/e, and in section 9 to be correlated to a similar degree 

 with net winter rate. Of im])ortance now is a consideration of tlie relation 

 between age at first egg and annual rate. .Vll of the birds with annual 

 records are included in the correhition taliie to derive the <-onstants: 



Number of l)irds 25(i0 



Mean age at first egg 205.37 



Age standard deviation ±30.56 

 Mean annua] rate 57.57 



Annual rate standard deviation ±9.57 



Coefticient of correlation — .Ofi57 ±.0133 



The magnitude of the coefficient of correlation given abo\e is insufficient 

 to establisii any relation between age at first e^^ and annual rate of lay- 

 ing. The assumption therefore seems warranted that age at first egg and 

 annual intensity are independent of each other. 



15. Correliilion rxliocn W'c'nilil n! First />_'/// "//'/ .liniiiiil Rale. 



Body weight at the beginning of the laying year might be thought of 

 as a crude measure of capacity for food consum])tion and as such body 

 weight might be correlated with annual intensity. The entire population 

 was assembled in a correlation table to discover jiossible relations. The 

 constants calculated are as follow ■-: 



Nund)er of birds 250 1 



Mean weight at first eg.a 5.5 t 



Weight standard deviation ±.73 



Mean annual rate 57.62 



Annual rate standard deviation ±9.57 



Coefficient of correlation — .llTi ±.0133 



Tiie degree of correlation shown between body weight at first egg and 

 annual intensity is small but .statistically significant. There is but a slight 

 tendency for smaller birds to exhil)it higher annual rates. This correlation 

 may be attributed to the somewhat greater intensity of early maturing 

 pullets and such pullets would normally show lower body weights than 

 later maturing pullets becau.se of the time element. The degree of corre- 

 lation formed above is of no practical importance, as it is too slight to be 

 used for prediction or selection purposes. 



