Hi Chickengr;
one of the main problem with inbred line are the fertility .especially from the roosters.
a study has been conducted to see what the difference in the fertility between inbreed line and a NO inbred line .
they mated a inbred line Rooster to his half sister and unrelated hens ( not inbred . forward mating method ) . the result of the hatching from both hens where a same about 80%.
than they Mated a inbred hens and a No inbred hens to a No inbred rooster . the result of the hatch from both hens where a same and higher 91%.
So the conclusion was that the inbred rooster loose they fertility BUT not a inbred hens .( they fertility stay high ) the genetic and the condition will affect they fertility .
with Darwin 1 and his sister Daisy I only managed to hatch about 50% . this line has been bred badly .the only thing good about t they kept t pure. that is an asset .
Selective breeding can fix that.
chooks man
thank you. that explains why the eggs didn't hatch. the breeder had a few roos with hens so my couple might have been related. I am afraid that my cockerel marco might be inbred. the breeder does change the roos every 1,5-2 years so I am praying.