Hi! I used to work in that area. In general though, look at the trees that do best in the area, and you'll get some ideas from just driving around. If you can, visit old dairies. The real old ones almost always had some trees the cows would be able to eat in rough times, I believe mostly acacia. Maybe you'll be lucky
enough to get some seeds. Walnut and sycamore I think also do well in the area, as do oak, but during droughts both walnut and oak might make your cows sick if they don't know not to eat it. Keep a few smart girls in your herd to teach maybe? Depending on where your at, you may be able to plant willow or elderberry. Apricots and almonds are also grown in that general region. Moringa
should also do well. Eucalyptus also do well, but their litter is not good for grass growth, whereas moringa is edible to cows from what I know. Good luck!