Brief description of the vitamins. Below I provide a brief overview of what the different vitamins mean for our birds — both in case of a deficiency or an excess, or in combination. It gives a good idea of what is in our diet. As mentioned earlier, our food products usually contain these vitamins in sufficient quantities, but it is still good to know what each vitamin does and how important they are. 1 – Vitamin A: Contributes to the normal formation of plumage and the proper functioning of the mucous membranes.
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