The AVMA produces policies in response to member requests and stakeholder interest. These statements are general and aim to encourage improvement based on the best available scientific evidence. In 2005, the AVMA changed its policy on pregnant sow housing, stating that "given the number of variables and large variation in performance within both group and stall systems for pregnant sows, no one system is clearly better than others under all conditions and according to all criteria of animal welfare". The AVMA's policy was adopted after a comprehensive review by a multi-disciplinary, multi-perspective task force of experts that produced an accompanying review of housing for pregnant sows. The AVMA has voted on several proposals to take a formal stand against the forced feeding of birds to make
foie gras. Although foie gras has been banned in many countries in Europe, as well as in the U.S. state of California, because of an absence of science specifically addressing the welfare aspects of foie gras production, as well as conflicting opinions among its membership, the AVMA opted not to take a stand either for or against foie gras. The AVMA has published a welfare implications of foie gras production backgrounder. The AVMA has received pushback from many veterinarians for its classification of
ventilation shutdown plus (VSD+) as "acceptable under constrained circumstances". Many veterinarians regard the method as cruel and have questioned the justification for the classification. In its guidelines, the AVMA relied only on one report from
North Carolina State University and argued this gave evidence that VSD+ provided sufficiently limited suffering. However, this unpublished report's
methodology has been questioned by organizations such as the
Animal Welfare Institute for using an untested metric for stress (using
heat shock protein 70), containing mathematical errors, having unclear writing, and more. Despite the AVMA's Guidelines for the Depopulation of Animals stating that ventilation shutdown plus should only be used as an extermination method in poultry in constrained circumstances, it has become the most common method of exterminating large flocks. ==Legislation==