A feed bag includes a body bounding a compartment, the compartment being adapted to hold a feed material. The body has a first end with an outlet formed thereat and an opposing second end. A vent port is formed on the body so as to communicate with the compartment. In one embodiment a filter is coupled...http://www.google.fr/patents/US7168459?utm_source=gb-gplus-shareBrevet US7168459 - Feed bags and methods of use
