I dare say you all know the basic idea of the bull box but if not i will try to explain,the box i had was about 6foot long and about 2 feet high,it was made up of two boxes either end which you kept the hens in and one large section in the middle for the cock,the cock would be your best breeding cock and 4 hens which you wanted to pair to him,the idea was to let 1 of the hens in with the cock at a time so that he could tread them so you would finish up with 4 pairs of eggs in one go,you had to have other pairs ready to put the eggs under but it meant you would have eight youngsters off your best cock at a time,if you wanted you could then put 4 differant hens to him meaning you could do 2 or 3 years breeding off your best cock in 1 season and the youngsters would be all half brother and sister so you could then pair them back to one another to create a family basically around your best cock bird.I will see if i can find the video and if anyone is interested i will send it out to them and then they can send it on to the next person.