summerb123
Free Ranging
Here's the actual science about why excess calcium is dangerous. It's a very well researched topic.
http://www.worldpoultry.net/Breeder...-damage-is-emerging-in-laying-hens-WP008719W/
http://www.hyline.com/aspx/redbook/redbook.aspx?s=5&p=36
http://nhjy.hzau.edu.cn/kech/synkx/dong/2bao/UrolithiasisChina.pdf
thank you so much!!