PETA Urging MLB To Rename 'Bullpen' To 'Arm Barn,' It's Insensitive To Cows!

Houston Astros closer Ryan Pressly is now warming up in the ... arm barn??? If PETA had its way, those words would be muttered at some point during this month's World Series ... 'cause the org. is urging the MLB to stop using the term "bullpen" to…