Good luck, Ben.
I happen to have listened recently to
Geoff Lawton talking about this. He said no matter how small your acreage is, you can rotate your cattle. Just make 12 divisions with the same size, and move your cattle every month to the next lot (assuming your grass grow equally every month, otherwise, adapt the design). Your divisions are roughly 500 sq meters each one, it
should be enough for a few animals. You can tell how much cattle you can have by watching how much grass is left in the lot when the month is over. It's recommended that at least 1/3 of the grass is not eaten before moving, for preventing bare soils. Portable fences, portable shack and fresh
water is all they need. Instead of shacks, you can let a few trees grow for shade.
Even if you aren't producing grass yet, moving the cattle is a good idea, since it will help fertilizing the lots, preventing over compaction.
Sepp Holzer has his cattle fed on wild grass, even with toxic and poisonous herbs. He told in a book that he watched an ill cow that recovered after eating a plant that is supposedly poisonous. The cow ate it as if it was medicine. Animals know better than us what they need to eat, as long as they have
eatable edible grass, shade and fresh water, they should be fine.
Please, tell us a little more about your design, maybe we can give you more ideas if we know what your strategies are.