All domesticated animals evolved in an environment that was very different from that in which they are currently housed. Thus, livestock and poultry have environmental needs that were shaped by evolution. The characteristic of sheep to graze while goats browse was shaped through evolution, and these characteristics dictate what these two different species need in relation to both foraging behavior and dietary nutrients. It is critical to keep this basic principle in mind when designing animal environments because although an animal's inherent needs are able to change, these changes can only occur over thousands of years. Our rapid progression of developing animal agriculture practices means that the environment in which we keep livestock is altered at a much quicker pace than these animals are able to evolve. Therefore, sound management practices dictate that we strive to create a match between the nature of our livestock and that environment in which we house them.
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