128 MAINE AGRICULTURAL EXPERIMEXT STATION. I909. 



TABLE IX. 



Showing the Correlation beticeen Fertility of Eggs and IVinter 

 ( November i to March i) Egg Production. Data for igo8. 





J 



V 



-* 



2 



10 



T 



CO 

 



Per 



■* 00 



Cen-t. 



>0 (35 



m CO 



I^ CD 



TO CO 



Infertile 



CO r^ ^ >o 



T t *? ■? 

 -* 00 CQ 







CO 



«o 

 1 





 to 



10 



CD 



1 



X 

 CD 





C5 



X 



5c 





0- 5 



.5-10 



10-15 



S 15-20 



? 20-25 



b 25-30 



c 30-35 



5 35^0 



a 40-^5 



►- 45-50 



= 50-55 



3 55-60 



■- 60-65 



S 65-70 



5 70-75 



2 75-80 



fe 80-85 



85-90 



90-95 



95-100 



1 



1 



1 



1 



1 

 4 

 3 

 1 



3 



I 



9 



} 



1 



2 

 1 



I 

 1 



i 



1 

 1 



3 



1 



1 

 1 



1 



- 1 - 



2 _ _ 



3 11 

 1 - - 



2) 2 1 

 3| 1 1 



- 1 1 



3:! 



- 1 - 



1 



-. 1, - 



1 

 1 



- 

 2 



- 



' 1 



1 

 1 



1 

 1 



1 



1 

 1 



1 



1 



1 

 1 



1 



1 



1 



1 

 1 



1 



" 



- 



_ 



- 



1 



- 



1 



1 











6 



5 



16 



15 



12 



12 



11 



5 



11 



5 



1 



5 



1 



3 











1 



Totils 



3 



14 



12 



23 



13 



9 



7 



4 



5 



5 



4 



4 



4 



1 







° 







" 



1 







1 



110 



only allowed to stay in the breeding pens throughout the season 

 in order to learn just how poor a record they would make for 

 the purposes of the present study. The principle should be 

 clearly recognized that some hens are "shy breeders" just as 

 are some cows. Any method by which such birds can be 

 thrown out and prevented from increasing the number of eggs 

 which it takes in practical work to produce a living chick will 

 be useful and profitable. 



The Relation of Winter Egg Production to the 



Fertility of Eggs. 

 Admitting the fact brought out in Tables VII and VIII that 

 there are great individual differences among different pullets 

 and hens in respect to their ability to produce fertile eggs, the 

 further problem is raised as to what influences are responsible 

 for these differences. Vlnat underlies the fact that one hen in 

 a breeding pen will have say 50 per cent, of her eggs infertile 

 Avhile another hen in the same pen will have none of her eggs 



