One of my hens has been having problems with becoming egg bound for about 6 months now, I also had another hen (most likely half sister to the egg bound issue one) become egg bound about 2 months ago. I have them on Nutrena's Feather Fixer for feed due to there feathers looking awful with the other feed I originally had them on. Could the egg binding problems be linked to the high protein diet I have them on? There feathers are finally starting to look healthy but I wonder if I should put them on something else? Also, I do have crushed oyster shell available 100% of the time for them.