53 

 SUMMARY 



Based upon the foregoing data, the following figures show the degree of cor- 

 relation between the characters stated: 

 1. Between hatching date and weight at 150 days (for the 



entire flock) -.3293±.0194 



'-2. Between hatching date and weight at first egg ... — .3807 ±.0201 



3. Between hatching date and age at first egg . . — .1487rb.0228 



4. Between hatching date and winter production (for the 



entire flock) . . . . . -.2920±.0218 



5. Between hatching date and winter production (for the 



genetically early maturing birds alone) . . . — .4790±.0254 



6. Between age at first egg and winter production (for the 



entire flock) -.6061±.0151 



7. Between age at first egg and winter production (first 



three hatches only) -.6413±.0320 



8. Between weight at 150 days and winter production (for 



the entire flock) 4-.2758dz.0220 



9. Between weight at 150 days and winter production (for 



the hatches of April 15 and 22 only) .... +.2475 ±.0545 



10. Between weight at first egg and winter production (for 



the entire flock) -.1894±.0231 



11. Between weight at first egg and winter production (for 



the first eight hatches only) — .2963±.0269 



12. Between average daily gain, 150 days old to age at first 



egg, and winter production (for the entire flock) +.2899 ±.0220 



13. Between average daily gain, 150 days old to age at first 



egg, and winter production (for the genetically early 



maturing group alone) +.2055±.0318 



14. Between weight at 150 days and age at first egg . . — .2135±.0221 



15. Between weight at first egg and age at first egg . . +.4604±.0185 



16. Between average daily gain and number of days, from 



150 days old to age at first egg — .4145±.0196 



17. Between winter and annual production, for three pre- 



vious flocks -.6214±.0142 



The most important single characteristic upon which to select pullets for 

 winter production is age at first egg. Weight at 150 days and hatching date 

 are of equal importance in such a selection, but of much less significance than 

 age at first egg. 



REFERENCES. 



Hays, F. A. and Bennett, J. S., The Correlation of Sexual Maturity to 

 Annual Egg Record. Poultry Science II. No. 6. 1923. 



Hays, F. A. Inbreeding the Rhode Island Red Fowl with Special Reference 

 to Winter Egg Production. American Naturalist. 58 No. 654. 1924. 



Hervev, G. W. New Jersey Agricultural Experiment Station Bulletin 389. 

 1923. 



3,500. Order .547. l-S-25. 



