I have'nt found much information on how to implement the "Darkness System"..is anyone using it and if so at what age do you begin and how long does it take for the complete new feathering to occur?

Hello everybody. I just joined the forum today. I have one question. If a pigeon hatches out in early January, when will it naturally moult that year? Cheers

Could anyone suggest a good, informative and up-to-date DVD for racing pigeons on the darkness system for young birds and feeding methods?? Also a supplier or where to purchase, would be better if web based as we live in rainy England.