Question for Farm & City Centre

I have 10 Brahman Heifers in Beatrice and 7 Hard mashona type in Murewa. The 10 heifers are btwn the ages of 3 and 4 years old and 2 have already conceived. My question is that, what medicine should i get in order to keep my heard healthy considering they are in different area? Can i buy meds online so that someone can come and pick them up?

Also what type of grass can i introduce them to that will have all the nutrition