1st: Feeding cotton seed. I saw on this board some times in the past, can't find it now, that feeding cotton seed interfered with milk production if fed to young heifers. comments as I use cotten seed here in SW Ga. and it is a staple for winter feed for most people. 2nd: diatomaceous Earth. I have read that it will rid internal parasites and other things if used regular in prescribed quanities. Can be liquified and poured on. It is cheap if it works as a wormer.