That made me lol

|)
I am certain I've seen both Cos & Romaine in supermarkets

To be honest I didn't even know you could feed piggies lettuce until I joined this forum, I've had 4 piggies before these & they weren't fed veg that was high in calcium yet still 2 had small stones, fortunately being female they passed them, I would check their bits regularly to see if they had reformed. It's one of the reasons I like to have female pigs because I am fully aware of the problems that poor boys who have stones encounter.
My previous pigs were fed mainly celery, cucumber, carrot, broccoli, tomatoes & bell peppers.
They rarely had kale & never cabbage or lettuce.
It's interesting reading about the dry food calcium amount as well. This is why I am fairly keen on using Wagg food as I have read it is fairly low in calcium compared to other dry foods. I also limit their pellets/mix now the youngsters are 6 months old, I never give them a full bowlful they get about 2 tablespoons twice a day between the three of them & it all gets eaten up; but have access to unlimited timothy hay at all times rolleyes