In the winter period, pigeons have to receive as little medication as possible. Let nature follow its course, except in the cases with serious clinical diseases.
To support nature, you can, during the winter period, for two days a week strengthen the natural resistance drink and one day a week Farvisol in the drinking water. For the remaining days clear water.
You can use the Bony Basic System to bild a solid base for next season. So preparations for breeding can be made under good conditions and new born youngster are ensured of a great start.