To keep the server running smoothly, there are limits on how many animals or mobs you can keep in one area. If you try to raise too many cows or chickens in a small space, it could cause lag or some animals might disappear. Spread out your farms and only keep what you need. This helps everyone enjoy a smoother game.
How many animals can I have?
The limit varies, but aim for no more than 15-20 of each animal in one spot. If you can't spawn more mobs, try moving the farm further from the cluster of mobs or expand the farm area!
Will my crops be affected?
Crops are fine to grow, just don't overbuild huge auto-farms in one location.