Bantam Chicken/Rooster Group

Hoping someone can give me some advice...one of my Americaunas is laying eggs with thin shells and calcium deposits on the outside of the shell. Any ideas?

I just joined zootoo and this group. I raise and show chickens as a hobby of mine. I show my chickens for 4-h. Of my 16 chickens, 6 are bantams. 1 golden sebright hen, 2 dark brahma rooster bantams, 1 white cochin bantam rooster, 1 black silkie hen, … more ›