While breeding animals, I encountered multiple crashes on my 14w31a server. All graphical options set to max/unlimited except render distance @ 22.

To clarify, the server itself crashed, not my minecraft.exe

I have pens of sheep, chickens, cows, and pigs near each other, just square fences of roughly 5x5. There are 20-50 animals in each pen as the crashes occured, and the crashes happened while I was in the middle of feeding many animals simultaneously. It occured while feeding sheep and cows multiple times, both while holding the right-click and also while clicking individually. It happened after roughly 2 dozen feeds each time. Attached are my logs from this afternoon.