We use the Ivomectin pour on, but none of our Brahmans like any kind of pour on wormer, or fly spray for that matter! It seems to irritate their skin. You do have to be very careful what you use, make sure you read the labels, it will indicate if you can us it on Bos Inducus cattle or not. Here in Texas pretty much everything you can buy now is approved for Brahman influence cattle.
The previous post was correct.. don't feed your Brahmans milo or a milo mixed feed, they'll definately founder. If you're having feed milled, corn, oats and a dairy type pellet is good.. or cotton seed or hulls. Make sure they always have plenty of "roughage".. either hay or pasture. Brahman's won't do as well on a strickly grain diet as continental or european cattle.