roo and fertilization time period

[kfacres]

how quickly after introducing a new roo to the pen, should one expect him to sire fertilzed eggs?

these hens have been unexposed, and right now have a young roo in with them.. not sure if he's getting the job done or not.. Thinking of bringing in a mature roo with the group.. how long before his eggs are getting laid.?

 

[the Pollo Loco]

pop an open and check for the bulls eye... that's the best way to tell!!!