Note that livestock isn't necessarily always for food (meat, eggs, milk, lard, etc.), nor only for products made from slain animals (leather, gelatin, etc.) They may be working animals, guard animals, transportation animals (mounts), animals for creating fabric from their coats (e.g. wool), etc. Some may keep the animals as pets and use their manure for compost. Some animals may be considered ornamental, such as peacocks or swans.
Warning: Use caution and research anything you find here before raising, eating (or otherwise using) it, to ensure it is safe, and otherwise okay. Many animals contain viruses that could spread to humans and cause a pandemic—not to mention the risk of parasites, prions, bacteria, etc. Also, some farming practices endanger the farmed species, and the animals those species eat.
List of livestock forums (this is not comprehensive, and these forums are not specifically only for livestock discussion):