POULTRY LABORATORY GUIDE 29 



Figure carefully the following percentages : — 



Per cent of fertile eggs to total eggs. 



Per cent dead germs to fertile eggs. 



Per cent broken to fertile eggs. 



Per cent dead in shell to fertile eggs. 



Per cent crippled to fertile eggs. 



Per cent vigorous chicks to fertile eggs. 



Per cent vigorous chicks to total eggs. 



The following is a very satisfactory form of 

 incubator record containing all the facts per- 

 taining to the hatch. 



EXERCISE IX 



Selection, Care, and Place of Setting 

 A Hen 



The majority of chicks are hatched by the 

 natural method, and where only a few fowls are 

 to be kept this method is usually very satisfactory. 



Mature fowls are better than pullets for in- 

 cubating eggs; not all hens make good sitters, 

 however; for that reason select with care a bird 

 possessed with as many of the following qualifi- 

 cations as possible. She should be of medium 

 size, in perfect health, neither thin nor grossly fat, 

 possessed of a quiet, gentle disposition, allowing 

 herself to be easily handled after dark; she should 



