358 POULTRY PRODUCTION 



grains, in one case 84 per cent., and in another over 88 per 

 cent, of the lime of the egg shell was unaccounted for by 

 any feed given aside from the oyster shell. When broken 

 glass was substituted for the oyster shell, fewer eggs were laid 

 and the shells were thinner. 



Oyster shell contains 95 per cent, carbonate of lime. One 

 pound of oyster shell contains lime enough for the shells of 

 about eight dozen eggs. Like grit, shell should be fed in 

 sizes to suit the size of the stock. Clam shell is not considered 

 of as good feeding value as oyster shell. 



