I guess this might be a complicated question with a complicated answer, but here goes. Hypothectical question. Supposed i purchased a fairly new strain of a particular breed of chickens. I raise all the birds from eggs. Hens start laying and roos start crowing. Now suppose all these bird meet the standard according to breed and I want to sell eggs and chicks from this flock. How do i document that these birds are indeed the strain they are claimed to be? Also, in order to futher grow my small flock, how do I choose a roo to do this with. Knowing that any roo from the same strain is going to be very closely related to the birds I already own. Do I go outside my new strain and get another roo of the same breed, but different strain, for breeding purposes, and If I do, would that now mean that my birds are now not the original strain that I started with but a hybrid of 2 differnt strains. Or would I approach the original breeder and purchase another one of his roos and then continue to line breed the birds i already own. And what if I just decide to choose the best roo chicks from my original flock and use these to futher my breeding program. I would at the least be breeding half brothers and sisters or sons to mothers and fathers to daughters. I currently have 3 roos and 9 hens. I am running one roo over 5 hens and one roo over 4 hens with one roo in reserve. (he has some hens but they are of a differnt breed and we are eating the eggs). My current plans are to raise two different sets of chicks from my current arrangements, then swap the roos around to cover different hens and then hatch those chicks. Then when all the chicks become of breeding age, to use my reserve rooster to cover those chicks. That roo would be a uncle to all those hens. Of course i will also keep a few roos to breed back over the opposite mothers. Somewhere along the line I would be mixing hens/roos from the second flocks to the third flock and also reusing the original daddy roos over their nieces and grandaughters, but not their own daughters. Using this plan, would it be necessary to still bring in another roo from the original new strain or a roo of the same breed but of a different strain. and If so, how many generations would I need to grow before bringing in another roo. Of course, if the birds start looking wierd or not up to standard then I would cull and start over, but I would like to have a general ideal as how to move in the right direction. I have already culled way down to get the birds I am currently keeping.