<94 



POULTRY PRODUCTION 



with reference to tlie poles of the egg in a new-laid egg, it 

 may move up or down in an egg showing heat. At first it 

 becomes loosened on the side toward the large end of the 

 egg and later from the other side. In an advanced stage of 

 weakness, the yolks may appear swollen, caused by the 

 absorption of water from the albumen. 



Fig. 2;!7 



Fertile egg after twenty-four hours of incubation. (Courtesy of Bureau of 

 Animal Industry.) 



2. Shrunken Eggs. — These eggs are easily distinguished 

 before the candle by the size of the air cell. The shrink is 

 caused by the evaporation of moisture through the shell. 

 This may be caused by a eomparati^•ely short holding in a 



