one hen two roosters how to only have one fertile the eggs

[chickenmama109]

hi there, i have a d,uccle hen and i want to put hr eggs under my broody but i also have two roosters. one bantam and one huge one<not sure what breed>. i want the egg to only have the bantam rooster genetics in it and not the bigger rooster. how long does the hen have to be around only the bantam rooster for the egg to not have any of the bigger roosters genetics. thanks

 

[The Moonshiner]

Sometimes 2 weeks, usually 3 weeks, to be sure 4 weeks.
Someone on here suggests taking hen from both roosters and monitor eggs till she start producing infertile eggs. Then introduce the rooster you want and start with 2 or 3 egg after.
I really like that idea.