Cow with diarrhea

[longhorns in maryland]

I've got a couple four-year-old cows. And one is sick. Just wondering if I could get some advice. She's off her feed. She had a dry cough this winter but everything else was good. Good appetite. I dewormed her with Ivermec pour on thinking it might be lungworm. About a week after that she developed diarrhea. She's off her feed but eating hay. She drinks water and licks the salt block. But she's just not right. The diarrhea isn't off color or bloody but it's definitely diarrhea and it's got a different odor. She's had it about 5 days now. I've been reading a lot about this Johne's disease. I've had her since she was 6 months old. She's never been sick before but I guess this bug can crop up at any time.
I've got some LA-200. Should I try that? Would welcome any ideas.

 

[dun]

Before giving antibiotics willy-nilly, you need to stick a fever stick up her butt and see if she has a temp.

dun

 

[milkmaid]

She's off feed but eating hay? what else had you been feeding her besides hay?