Not cows but relevant, my rooster was quite ill a week or so ago and I had no idea what was wrong with him but knew something was. He wouldn't get off his perch, not eating or drinking , dull feathers, purple/black comb and very quiet.
I isolated him from the girls then gave him a couple of mls of garlic steeped honey and plenty of water. Next day he was the same so gave him more of the honey garlic. By day 3 he was improving a little in that he was now coming out of the isolation coop to sit outside. Was still quiet though. I then made him up something nice to eat mixing grated carrot, grated apple, rolled oats, honey garlic and natural yoghurt with pro biotics (no cane sugar) which he ate like he hadn't eaten anything in a month of Sundays. Gave him this concoction for a couple of days and he is now back to normal. Comb is a good red colour, feathers nice and shiny, got his voice back, and all is well again. I suspect he had eaten something that he shouldn't have, he sure was a sick chook.
Glad to hear your positive results with your cow
Life is what happens to you while you're busy making other plans.
- John Lennon