For a season they might get good results, but when it comes to the third season with pairing still in the bought-in consignment, they are in trouble. Inbreeding takes its toll. Next I believe the breeder is at fault. He is anxious to get those early chicks so that they are rung on January 1st. At the back of the mind is another reason.
Unwanted chicks are big enough to sell when people tour the country in summer.
I hear you say. Those who breed to sell aim for a selling season. Those two last words are not mine but have been used time and time again in articles by feather merchants. He plays around with light. He has programmed the time the light comes on and when it goes off increasing the daylight hours to hoodwink the birds that Spring and Summer has arrived.