There are no worries about Mad Cow Disease in this environment. The biggest irritation these lovely ladies would experience would be random cyclists stopping and taking photos, then remembering to bat their ridiculously long eyelashes over their blissfully brown eyes.
Living like this probably means they don't need hormones to increase their milk production, and hopefully they don't get pumped with many antibiotics either.
I just realised the title is ambiguous. It refers to cows munching grass, not me munching a cow.