Never heard of this...good idea.I sometimes add food coloring to the oyster shell to make it more appealing if I notice thinning shells.
they love the blue and green. The yellow and red weren’t hits. On some of the lighter brown shells I could see hints of green specks! Maybe I should try this again since my leghorn is laying. Hmmm.Never heard of this...good idea.
And I can't help but pose whether this would change the color of the birds egg shells.
I know it won't, but still... wouldn't that be fun!!