Does anyone know if pour on Ivermectin can make cattle abort? Perhaps if given a bit too much or something? I ask because 2 of our cows and 1 of my uncle's aborted after we did them. It could have been other things that caused it but it was really coincidental that they all did so after we treated them. We have used pour on Ivermectin for many many years and not had a problem until this year. Any ideas??? Thanks!