have to agree with you , all lofts keep birds that work for them and as for a strain there just the name of the previous owner , a good bird is a good bird but strains tend to sell better than individual performers , i have birds from a few familys most have had no introductions but i know if continued id loose anything worth keeping by keeping so called pure , so my plan after this years breeding is to blend the familys i have together into my own family of birds ill have some failures and hopefully some worth putting back in but i can still say my birds are from these familys a , b , c and have been blended into that of my own