When you refer to bringing in new stock, you are probably referring to out and out breeding or flock sourcing (bringing in new roosters from different sources or from the same source, respectfully) but over time, this can lead to inconsistent production rather than the improvement breeding you will want to seek and the latter, though better, doesn't really help you maintain the diversity of your breed. Other systems are flock mating, rolling matings (old farmer's method) or spiral matings (clan matings). Schrider has said that some breeders have kept a flock for 80 years without the introduction of new blood by using spiral mating. Both rolling matings and especially spiral mating methods will let you maintain genetic diversity within your flock as a whole and improvement breeding (keeping your best in each group). Flock mating is not as controlled as you are just keeping a several males in a flock as one breeding unit (this is usually the large hatchery method & is why their stock generally declines) -- this would also be a confusing way for me to do it.
Help. Can you describe these two methods?
Thanks
