The birds feathers are primarily made of protein so this time of year they can use the extra protein. Try it you may start getting more eggs because you would be supplementing their diet with higher protein feed which helps with the molting regardless if they are going through light or heavy...
Chickens have different degrees of molt. Some birds go through light molts which aren't very noticeable and other birds go through heavier molts which are very noticeable. I switch my birds over to a higher protein feed. The birds feathers are made up of primarily protein so since they need it...