I don't know moulting seasons. As I never seen them naked. Feathers used to drop and at the same time new feathers will grow.
Based on all feedbacks I think,
all it majorly need is protein so I'll get some fly termite and provide them.
And y is it not happening to roosters..
Meat and fish in cooked form?
If I give this will the feathers grow-back or shall I get some tabs or syrups to add in their foods.