I clearly have the unpopular opinion in that i feel like the petting zoo pack is overrated and doesn't add all that much to the game. I live on a station so plenty of the animals we are talking about are ones I deal with regularly
Chickens? I have some as egg and meat producers
Cows? The property runs 4 mobs with 4 breeds, I drench, Vax, muster, preg test ext ect these guys
Sheep? There's a few thousand for me to chase around, I don't want to build them a habitat in a game
Goats? Pigs? Rabbits? Massive feral problem. Am part of population control group.
Ducks? Don't have any but I think wild duck species in the game would add value
Donkey? Horses? I love both, was a mildly successful equestrian before I had kids, would rather them not be in the game. Some wild type species could add value like Onager, Kiang, but that's about it for me.
It's my personal opinion, but petting zoo reminds me of work and introduces animals I'm already interacting with and caring for. I'd rather have exotic wild species than domestics. I feel like it doesn't really fit into the wildlife conservation message that's a core of both the game and irl zoos
We also have to consider how release to wild would function because it's generally frowned upon to let stock animals establish in the wild