Ok so lets say you take a breed like goldens (LARGE population right?)
And you cull all those who won't swim/retrieve, and you cull all those who shy at gun shot. You cull all those who don't have the golden easy happy temperament. You further remove any that don't have conformation champion before their name. Then you test them all and remove any that don't come back excellent on all test, and you cull all those who have recessive issues in their lines. (dominant issues are easy to get rid of).
How many dogs will you have left to breed together? Do this every generation.. how long before their gene pool starts making the cheetah gene pool look deep by comparison?
And you cull all those who won't swim/retrieve, and you cull all those who shy at gun shot. You cull all those who don't have the golden easy happy temperament. You further remove any that don't have conformation champion before their name. Then you test them all and remove any that don't come back excellent on all test, and you cull all those who have recessive issues in their lines. (dominant issues are easy to get rid of).
How many dogs will you have left to breed together? Do this every generation.. how long before their gene pool starts making the cheetah gene pool look deep by comparison?