I did a project with calcified seaweed and dairy cows in 2001...
Just a few comments: CS is very slow acting, so no quick fix of your problem.
I can't see any reason why you should have to remove the sheep - the cows stayed on, anyway.
I'll see if I can find the e-version of my thesis (probably on ancient floppies!), if not, I'll try and extract a bit more info from the paper.