The first two-Jersey or Jersey crosses, which ARE dairy breeds-are in BAD shape; the other adult cows-the black baldy, which I'd guess to be the very typical Hereford/Angus(both beef breeds) cross, or perhaps, a Holstein(dairy)/Hereford cross, are not as bad off, but they certainly aren't in good shape; they may be younger than the first two cows mentioned. Most of the calves visible look like Holsteins; probably bought off a dairy at a VERY young age...it is typical for the dairies to pull the calves off at a few days of age,and sell them for others to raise on 'nurse cows' or as bottle calves- untimately for slaughter. I'd bet that's how the owner 'uses' these cows-and he may also breed them to raise their own calves for slaughter. A cow is a lot more willing to allow a calf not her own to nurse...
No matter what, these cattle are NOT receiving adequate feed/care, and you should follow some of the suggestions here to contact the land owner and/or report the situation to the proper authorities. It is UNCONSCIENABLE to confine ANY animal and then allow it to suffer from lack of enough food and/or water, OR lack of medical care(the infected eye you mentioned...!!!- ESPECIALLY over the piddling amount animals in such poor condition will bring at the local livestock auction(which is undoubtedly where these animals are destined to go.) An effective approach may well be the liability one of the risk of the cattle getting out; even if they don't care about the cattle, they may care about the possibility of getting their OWN sorry hide sued off!! I have not much use for PETA; but, you are in CA, and if you don't get any response that is helpful to the cattle, you just might put in a call to them...
Good for you, for caring enough to be concerned about these cattle!
Margo