Sunflowers are pure grabage, no nutrients, and not something they need or can use that is healthy.
You want to fatten a rodent up, try yoghurt, mashed potatoes, pastas, etc.
Oily seeds are great for treats only
I've found some of the best groups I've put together were raised together from weanling size. They fight less and they get along better than groups put together when they are older.
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