there are 8 hereford cows with 3 and 4 month old calves all kept together with the hereford bull. he has started breeding them again. tonight , i found one of my cows down, her back end will not work she is dragging it and can not put her legs under her. called vet and he won't be out till tomorrow. gave her 30cc of dex and 10cc of banimine. my question is : could the bull have done this or is it some kind of disease or toxin?