Genetics question

If I breed a Silver Birchen roo to a Blue Birchen hen,   will I get 50% black and 50% blue?  Also, how then would I get true black birchen from the two origanal birds?  Would I have to breed the roo (daddy) back to the peeps I get that are blacks?  I am trying to start a line of Silver Birchens.  I think they are so pretty.  And I'm not to good at understanding genetics.  I would like to take the black birchens to local farm show someday.  Makes raising them a little more interesting I guess. (they are Marans)  thanks yf Betty

  Also, how then wouldIf I breed a Silver Birchen roo to a Blue Birchen hen,   will I get 50% black and 50% blue? I get true black birchen from the two origanal birds?  Would I have to breed the roo (daddy) back to the peeps I get that are blacks?  I am trying to start a line of Silver Birchens.  I think they are so pretty.  And I'm not to good at understanding genetics.  I would like to take the black birchens to local farm show someday.  Makes raising them a little more interesting I guess. (they are Marans)  thanks yf Betty

Predicting offspring depends if they are pure breeding or not - which you can not tell by looking at them. To try and develop a new strain/colour is very hit and miss and will involve lots of generations and culling of non-desirable traits/colour. You will need small cages so that you control which birds are mating with which and keep detailed records of who produced what . Plus you will also need a large flock otherwise inbreeding will occur and their general vigour will decline. All in all not an easy or quick task. Hope this helps without being too offputting.