RATE t)F GROWTH OF CHICKS 321 



k Tlie weights of chicks from pulU^t mothers were compared with those 

 from lien mothers. At hatching, tlie chicks from hen motliers were 5.01 per 

 cent heavier than those from jiullet motliers. At t weeks of age the chicks 

 from liens were 8.62 per cent heavier. At lb" weeks of age the chicks from 

 hens were 6.97 per cent iieavier than those from pullets. When the chicks 

 reached the age of 21 weeks there appeared to be no significant difference in 

 weights between those from hen mothers and those from pullet mothers. 



5. The chicks used in these studies averaged 61.00 per cent of the weight 

 of the eggs from which they were hatched. 



6. The mean weight of hatching eggs from pullet mothers was 56.19 

 grams and from hen mothers 5!). 56 grams. 



7. Pullets weighing less than .5 pound at i weeks of age were slightly 

 less vigorous than those attaining .5 pound or more at that age. 



8. No difference in vigor was observed, however, in iniilets weighing- 

 less than 4.5 pounds at 21 weeks of age and those weighing t.5 pounds or 

 more at that age. 



9. Heavy weight at t weeks of age or at 21 weeks of age was no criter- 

 ion of pullet-year egg production. 



References 



Benjamin, E. W. 1920. A study of selections for the size, shape and color of 

 hens' eggs. N. Y. (Cornell) Agr. Expt. Sta. Memoir 31. 



Card, L. E. and W. F. Kirkpatrick. 1918. Rearing chickens. Conn. (Storrs) 

 Agri. Expt. Sta. Bui. 96. 



Dunn, L. C. 1922. The relationshiii between the weight and the hatching 

 quality of eggs. Conn. (Storrs) Agr. Expt. Sta. Bui. 109. 



Halbersleben, D. L. and F. E. Mussehl. 1922. Relationship of egg weight to 

 chick weight at hatching. Poultry Sci. 1:11;3-1H-. 



Hays, F. A., Ruby Sanborn and L. L. James. 1921. Correlation studies on 

 winter fecundity. Mass. Agr. Expt. Sta. Bui. 220. 



Hays, F. A. and A. H. Siunbardo. 1927. Physical character of eggs in rela- 

 tion to hatchahility. Poultry Sci. 6:196-200. 



Hays, F. A. 1928. Relation of age of parents to hatchahility, livability and 

 fecundity in the domestic fowl. Poultry Sci. 7:106-115. 



Hays, F. A. and Ruby Sanborn. 1928. ^'igor in production-bred flocks. Mass. 

 Agr. Expt. Sta. Bui. 212. 



Hays, F. A. 1929. The inheritance of egg weight in the domestic fowl. Jour. 

 Agr. Research 38:511-519. 



Jull, M. A. and J. P. Quinn. 1925. The relationship lietween the weight of 

 eggs and the weight of chicks acctn-ding to sex. Jour. Agr. Research 

 31:223-226. 



Jull, M. A. and H. "W. Titus. 1928. Growth of chicks in relation to feed con- 

 sumption. Jour. Agr. Research 36:54-1-550. 



Kaupp, B. F. 1921. The rate of growth of single comb Rhode Island Reds. 

 Poultry Sci. 1:39-43. 



Upp, C. W. 1928. Egg weight, day old chick weight, and rate of growth in 

 single com!) Rhode Island Red chicks. Poultry Sci. 7:151-155. 



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