Calving/Health PenFeatures Panels and gates are 14 gauge, 1 1 2 inch square tubing. Self Catching Head Gate with Safety Release Mechanism has two emergency trip releases that quickly relieve pressure on an animal's neck if needed. This unit also works well for those who prefer to calve with the animal on its side. Both Calving Pen squeeze panels swing 180 degrees completely out of the way crucial when animal is calving and requires assistance from more than one person.