BROODING 



455 



first few days small chicks need to be watched closely, as they 

 may not return when becoming cold, and thus chilled may 

 result in bowel trouble and death of considerable number. 

 These stoves are provided with thermoregulators, as illustrated 

 in Fig. 181. 



In duck raising by the large producers pipes are used over- 

 head, as illustrated in Fig. 182. This is the same principle as 

 used in brooding, a thermoregulator being supplied on the 

 stove. 



•• ■«^ 





Fig. 182. — A brooder for ducks, showing heater, heat regulator, hot-water 

 pipes, and brooder box. 



Phillip has given the monthly hatching expectation in percents as follows; 



Monthi Per-^ent., Percent., Percent., -^lateTto' 



iviunm infertile dead germs m shell ^ ^.gj 



February 20 10 30 40 



March 10 10 30 50 



April 8 7 25 60 



May 8 10 27 55 



1 Term month means time of hatching, eggs being laid three to five weeks 

 previously. 



