inyati13
Well-known member
I have an outbreak of lice. I have not actually found the parasites on the cows that I have examined but all indications are lice. They are rubbing their hair off on the top of their shoulders, around their neck and some on the behind. I have caught it early and only about half the herd is showing any rubbing some in only a small spot or two. I introduced a new bull and a bred heifer in the past three months. They may also pick them up from the neighbors cows across the fence. It took me the last four days to get every animal treated. I used Ivomec, Eprinomectin. It is a pour on for a wide range of parasites including lice. I was wondering because there was a span of four days, could the last cows treated have reinfected the first cows treated. It is an issue of how long the Eprinomectin is still in the blood and effective for lice. My guess is that is too short of a window for re-infection. Does those in the know, agree?