This product is FANTASTIC, I had a poorly pet chicken which could only just stand on one leg, and went off the lay she was very ill, after using ZOLCAL-D for five days, once a day for five days, dose was 1ml , following two weeks every other day, then after that once a week, all given by a oral syringe with bottle adapter bought from local chemist, she is now back to her normal self .
Added to my chookies water, with access to shell and free ranging this just gives me the peace of mind they get their calcium intake daily, no complaints so far, eggs are solid :)