Mar., 1938] Electric Brooding of Chicks, II. Heat Requirements 31 



9. The main ijTojinlarities in the temperature under hrooders are 

 obviously caused by brooder design features, floor drafts and eliiek 

 movement. 



10. It is recommended tliat no more than 200 baby cliicks be pbiced 

 inider a 52" square electric brooder and not more than 225 chicks under 

 a 56" round electric brooder. 



11. It is our experience that loadings of baby chicks under elec- 

 tric brooders, higher than those mentioned above, were a direct cause 

 of high mortality. (Refer to mortality figures, 1933 and 1934.) 



Acknowledgment is here made of the valuable assistance rendered by Drs. 

 C. L. Martin and C. A, Bottorff of the Poultry Pathology Laboratory in mak- 

 ing the autopsies of birds, to Mr. P. A. Wilcox, Poultry Farm Foreman, who 

 assisted materially in the actual brooding of the chicks, and to Mr. F. D. Reed, 

 formerly of the Poultry Department, who assisted in the 1934-1935 experiments. 



