178 



POULTRY PRODUCTION 



very practical question of how to handle them during the 

 period of suspended development with the least possible 

 damage to their vitality and hatching power. 



Table XIX. 



-Relation of Time of Holding Hatching Eggs to 

 Theie Hatching Power. 



Age of 

 egga, 

 days. 



30 

 26 

 22 

 18 

 14 



No. of 

 egga. 



96 



96 



120 



120 



96 



Test of 1910. 



No. 

 broken. 



No. in- 

 fertile. 



50 

 22 

 17 

 15 

 11 



No. 

 dead 

 germs. 



23 

 31 

 44 

 36 

 30 



Per cent, 

 chicks 

 from 



all eggs. 



24.0 

 44.2 

 48.7 

 57.5 

 56.4 



Test of 1911. 



28 

 26 

 24 

 22 

 20 

 18 

 16 

 14 

 12 

 10 











6 



6 







28 



40 



36 



38 



36 



Time of Holding Hatching Eggs. — ^Holding eggs for incuba- 

 ting purposes is a necessary evil to be practised as little as 

 possible. Two weeks is generally considered as the outside 

 limit of holding eggs under the very best conditions that will 

 give satisfactory hatching results. Jackson^ found, as shown 

 in Table XIX, that the percentage of eggs not hatching 

 showed a fairly consistent increase for all periods longer than 

 two weeks. 



' Pennsylvania Bulletin No. 120. 



