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ACTUALLY A COMPLETE GBS SHOULD PROVIDE ALL THE CALCIUM THEY NEED. QUAIL UNLIKE CHICKENS ARE VERY EFFICIENT AT ABSORBING CALCIUM FROM THEIR DIET, SO TECHNICALLY OYSTER SHELL IS NOT NEEDED-- IT CERTAINLY WONT HURT THEM, BUT IF FEEDING PROPER NUTRITIOON IT IS MERELY UNNECESSARY SUPPLIMENT.
NOTE ITS NOT UNCOMMON TO GET SEVERAL SOFT SHELLED, OR SHELL-LESS EGGS A YEAR FROM COTURNIX, ITS JUST SOMETHING THEY DO FROM TIME TO TIME, NO NEED TO CULL ANYONE (UNLESS YOUR JUST HUNGRY
) ALL ARE CAPABLE OF IT BUT IT SHOULD BE A RARE OCCURANCE.
X2
Coturnix are very efficient egg shell creators from game bird feed, and the occasional "Shell less" egg is par for the course. It is a physiological anomaly, and has nothing to do with calcium intake. Feeding extra calcium is not bad, as long as it is not over saturated in the feed, causing a starve out. I give mine extra calcium to boost their bone structure. Go figure!
I think most of the people touting the mandatory addition of oyster shell, cuttle bone or what ever, are just feeding their birds chicken feed. (AKA. Flock raiser)
Adding calcium is not a problem, but adding it instead of good quality game bird feed, is just a chicken thing.
I don't know how to explain it other than that. Consistency is the key with coturnix, no amount of supplements will help out, and I don't know a darn thing about chickens, which is why I only post in this forum.