I was at the sea shore this week and I have found some inner skeletons of Squid. This inner skeleton is almost 100% Calcium and it is wonderful source for pet birds, and chickens! It is free of charge and very healthy for them. The bonus in this source is that it contains also some Iodine residues, that are much needed for the healthy of the chicken Thyroid function! I think that you can fined them for free of charge at your fish venders!
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