220 



POULTRY PRODUCTION 



bloodvessels its legs. The live germ floats about freely in the 

 contents of the egg when the egg is rotated before the tester. 



The dead germ may be recognized by the absence of the 

 bloodvessels, its adhering to the shell, or by the cjuite typical 

 pink ring surrounding it which is called the blood ring. 



The second test is commonly made at the end of the second 

 week. If the first has been accurately done there will be 



104 



A lamp tester. Tliere are many styles of testers but all wi.rk on the 

 principle of shutting off all light from the eye except that which passes 

 through the egg, thereby showing whether (here is a live embryo or not. 



only dead germs to test out. The live embryo at this time 

 appears to nearly fill the egg. In the one or two light spaces 

 which are usually present, bloodvessels will l)e noticed and the 

 embryo chick will frefpiently be seen to move when the eo-o- 

 is rotated. 



The dead germs may vary in appearance from typical 

 blood rings to embryo chicks of nearly normal size." The 



