I have no idea whether they are aware hence me saying I'm not sure. How do they feel when out in the fields, are they enjoying life?
I have a field behind the house that has sheep from early spring with lambs and their mothers. It's nice seeing them play, and funny watching their interactions. Most have pairs of lambs, and they race back to their mother for food. Sometimes the mother can't be bothered and either turns round or makes it clear she isn't interested.
I made friends with an old one last year who would come to the fence for bits of carrot and give me kisses through the fence. She was still very timid, sadly she didn't come back this year.
Sadly a fair few do die each year. It was sad the other year as I noticed a mother and a lamb near a hedge. She was there for two days laid there, occasionally turning round. Then the farmer came and she called in a way I hadn't heard any of them call before. The farmer walked over and there was a dead lamb I couldn't see for the grass. He picked it up by a rear leg and walked off carrying it dangling, with the mother jogging along trying to keep up with them.
This year there have been a few dead adults from being stuck on their backs, another lamb was taken off for fly strike, looked awful when I noticed and reported it to the landowner. And one I noticed on it's own by the hedge, barely alive, couldn't even lift it's head when I went up to it. Called the land owner who said they'd phone the farmer but probably not much they could do, was dead by the morning.
Edit: As for cows, I've seen many videos of them playing. I remember once, around 10 years ago, walking past a dairy herd. One came over, I pulled up some long grass to feed her, but she ignored it and just wanted to lick my face. Always stuck with me and often wondered what happened to her.