The most important factor in bringing in the hens is hearing the song of a breeding ready cock. That is why I always start conditioning the cocks first and when they are getting close, I then start the hens. Usually the cocks are on the ABBA fertility E, given once a week, three weeks before starting the hens. This year I had some lighting flickering issues and decided to replace the fixtures so I delayed starting the hens and today was their second once weekly dose of ABBA fertility E. Today, I also started giving both cocks and hens an additional mix.
Once the clutch is laid, I discontinue this mix but continue to add Miracle vitamin to the nestling food.