I have had an occasional cow in the summer grazing period with pink eye, in the past, that has cleared up with a dose of LA or Penn. and a patch. I now have heifers with January/February calves in a lot, and have had to treat 4 cows and 3 calves with in the past 3 weeks for what appears to be pink eye. but they are not clearing up with the usual treatment, so I am wondering if I have something else going on here. Usually we don't have pink eye till late summer, or when grazing tall headed out grasses. The usual pink eye symptoms of watery eye for a few days that seems to bother them in the sun, after day 2 or 3 if not treated it starts to get a white spot, and clouds up. these are Angus Hereford crosses, but it's the all black cows and calves with trouble so far.