We have used the bull box for the last 4 years our 2 main breeding cocks go on it with 4 hens and the eggs floated under feeders. The bull box we have was a gift from John Hunter from Aberdeen went up to see john and he had this bollbox on his dining table and his wife told him to get rid so i got lucky that day as the back seat was down before he changed his mind and on my way to Stirling. We think if you have good cocks they are good for getting some half-brothers\sisters, and find the best to start a family.