Co-op mineral????? :shock: :shock: :shock: :shock: :shock: :roll:
For Gawd's sake, try ANY other mineral! PLEASE!!
There HAS to be a problem for them to be eating that much. Test the feed and water and have some rations run. Something is terribly out of whack. I've been in the liquid feed business for 15 years, and a scenario like yours has a reason. You just gotta go find it. Any idea how much of the rye hay they are eating on a daily basis? It can't be much if they are eating close to 40 pounds of liquid a day.
I had a guy who is no longer a customer have a fit at me when his calves wouldn't eat a brome alfalfa mix hay, but they would gobble LOOMIX like there was no tomorrow. After looking the bales over pretty well, there was so much mud and dirt and dust and broken baler pickup teeth mixed in with it that it was no wonder they refused to eat it. The hay was barely fit for bedding. I told him if he put out a bale of straw they would clean it up in less than 24 hours. They did. It was still all my fault so I picked up my trough and went on about my way. He's still pi$$ed at me, but that's OK. Neighbors told me later he ground the crap hay with some decent straw and prairie hay at a mix of 6 good to one bad and they cleaned it up.
Bottom line, there is a problem somewhere.