I was feeding my large parcel of pigs when the game crashed.
In 14w29 and 14w30 feeding went without issue.
Environment
OS: Windows 7 (ver 6.1, arch amd64)
Java: 1.7.0_25 (by Oracle Corporation)
Launcher: Minecraft Launcher 1.5.1 (bootstrap 4)
Minecraft: 14w31a (updated Thu Jul 31 01:38:05 EST 2014)
Different cause, same crash as MC-64567