[Exabyte I]

Just wondering? is it bad to raise cows underground like this because whenever I breed the two the calf always dies when i come back and look

[SuperCreeper007]

I had pretty much the same setup, my cows kept dying, I asked VVolfie to come over and check it, and the server said that they had "killed themselves," so I just expanded the pen a bit longer and wider, and problem solved . Still have no idea why this happens, maybe in a confined space they go crazy and the server somehow kills them idk xD

[ColdF3ar]

Are there any other animals or mobs in the same realm? The cap is 100 per realm so if you have a large chicken coup next to it the cows will despawn. My only other suggestion would be to make the floor out of grass and use plenty of lighting.

[cubeguy314]

The same has occurred with my villagers. From what I've experimented with, any baby creature will despawn if the player is not within range of it. It's a similar concept to the despawning of hostile mobs.

[Cephyrian]

I use grass

[faldette]

My cow pen is also completely underground. While I do occasionally find meat and leather lying around from a randomly dying cow (sometimes outside the pen), I keep their numbers sufficient that one or two deaths don't hurt much. So, once you've got more than just cows, this setup should work just fine.