TIME TO STANDARD EGG WEIGHT 9 



Table 1. --Simple and Partial Correlation Coefficients Between 

 Time to Standard Egg Weight and Factors Affecting it 



Correlation Coefficients 



Simple Net 

 Correlation between Time to Standard Egg Weight (1) and 



2. Hatching date -.1111 +.0340 -.5323 



3. Age at first egg, days -.4174 + .0285 -.6419 



4. Weight at first egg, pounds -.2317±.0326 -.3307 



5. Winter clutch size, eggs +.3001 + .0314 +.1609 



6. Winter pause, days +.1340 + .0430 - .0582 



7. Broodiness, days +.2679 + .0894 +.4210 



8. Persistency, days - .0100 + .0391 - .6241 



9. Winter production, eggs +.3373* 



10. Annual production, eggs +.3015* 



11. Annual egg weight, grams —.6532 +.0221 



♦Correlation Ratio. 



Character of the Population Not Reaching Standard Egg Weight 



During the five years covered by this study a significant proportion of the 

 birds failed to attain standard egg weight during the first laying year. It seems 

 desirable, therefore, to study this group in order to discover if possible some of 

 the reasons why they continued to lay small eggs. Table 2 gives a series of means 

 for the population failing to reach standard egg weight, together with the means 

 for the population attaining standard egg weight. 



Table 2. -A Comparison of the Population Failing to Reach Standard 

 Egg Weight with the Population Attaining Standard Egg Weight 



Pullet Year. 



Age at first egg, days 



Weight at first egg, pounds. 

 Winter clutch size, eggs. . . . 



Winter pause, days 



Broodiness, days 



Persistency, days 



Winter production, eggs. . . . 

 Annual production, eggs. . . 

 Annual egg weight, grams. . 



The significance of differences in means recorded in Table 2 was determined 

 by means of the probable error where the frequency distribution was essentially 

 normal; in other cases by consistency. 



There was no significant difference in age at sexual maturity between the two 

 populations. 



