How did you get the dog to know which bird you wanted it to pursue in order to realize it recognized the individual?Mountain Man Jim,
The imprinting I seem to be realizing is to individual chickens. This contrast with what I think ideally goes on with sheep / goats where imprinting can be effectively to a large herd where imprinting to individuals may not be realized other than simply belonging to so same group owing to a common smell. Logic I have employed is when dog is imprinted on a smaller core of birds, it gives a starting point that softens the interest on chickens outside the group imprinted upon. Despite this the dogs seem able to recognize birds as individuals, at least older birds, even when not part of core dog was imprinted upon. Both dogs spend particularly attention to core birds even when they are scattered about in different pens during off season, the attention is of a socializing sort rather that the undesirable aggressive sort.
Additionally, in past I used a coonhound to aid with capture of specific hens or stags on walks where roost could not be identified. I could start walking after a specific bird and dog would then figure out I wanted that bird and proceede to capture it by penning it softly on ground. it took a while but dog learned not go after targeted bird all that hard. I would then pick up bird for examination or bagging, if former, then bird would be released on spot and dog would not pursue it unless directed to do so. Same dog could then be directed after another to repeat process and ignore first bird. This could then be repeated at another walk with minimal stress on birds captured. Dog could do this even with 30 birds running about. It may be only of academic interest but the dog's ability to focus and recognize individuals was impressive. Recognition seemed based on a combination of sight and sound.