I've been feeding ACV to my cows on & off for about 5 years now. I have added to the total mix ration (in a mixer wagon) at the rate of 60ml per head per day but have now reverted to pouring it in the water troughs daily or every other day. We think it is doing some good but still get recurring cases of mastitis in some cows and the odd new case occasionally. I haven't had the courage to stop using antibiotics but have cut back on the amount we used to use. New cases are drenched 100 mls mixed with water 2 x a day - seems to help. Not sure if it is the ACV or the seaweed but their feet are much harder now - so are my toenails since I started taking it!!