Hi Vivienne
When you store the products from your Premium Fodder factory, they go into a special storage in your animal sheds.
Those fodders are premium fodders.
When you ask or send ingredients, you are not getting premium fodders you are receiving or sending products to make premium fodders.
When you receive them, you store them in your Harvest & Products storage and they will be used next time you start productions in the Premium Fodder factory.