Industrial agriculture, because it depends on standardization, has bombarded us with the message that all pork is pork, all chicken is chicken, eggs eggs, even though we all know that can't really be true.
From my earliest memories, I loved the farm. My grandfather was a charter subscriber to Rodale's Organic Gardening and Farming Magazine and had a huge, well kept garden with an octagonal chicken house in the corner.
The cows shorten the grass, and the chickens eat the fly larvae and sanitize the pastures. This is a symbiotic relation.