Mar., 1938] Electkic Brooding of Chicks, II. Heat Requirements 17 



of 3c per kilowatt hour for electricity and $16 per ton for bagged coal, 

 the two methods are approximately equal in total operating cost. 



On the basis of the results of the previous tests and the work herein 

 reported, it is suggested that brooder loadings be restricted to the fol- 

 lowing: (1) 52" square brooder — 200 chicks; (2) 56" round brooder — 

 225 chicks; (3) 76" square brooder— 550 chicks; and (4) 80" round 

 brooder — 500 chicks. 



1935-36 EXPERIMENTS 



The experiments carried on from 1933 to 1935, as already re- 

 counted, established the brooder and its immediate surroundings as the 

 focal point of controlling heat regulation. The points of next investi- 

 gation were the difficulties which had consistently been present in all 

 previous work, namely, (1) floor drafts and (2) irregularities in floor 

 temperature. These were considered to be closely related and pos- 

 sibly one and the same thing. 



Experiments with the effects of three methods of control of these 

 two factors were developed in 1935-36 as follows : 



I. Application of additional under-heat on the floor under the 

 brooder. 

 II. Placing extensions on the outside edges of the three standard 

 brooders that were used, and adding curtains to these outer 

 edges. 



