The aim of the proposed rule is to remove the current ambient temperature requirements for various stages in the transportation of regulated animals. If accepted, this proposal would replace those requirements with a single performance standard under which the animals would be transported under climatic and environment conditions that are appropriate for their welfare making acclimation certificates for live animals other than marine mammals unnecessary.

This rule would also require transport compartments on aircraft to be opened during prolonged stop-overs, as well as the use of ground equipment to maintain appropriate conditions in the cargo hold during the stop-over. And, if finalised, the rule would eliminate the requirement for acclimation certificates for animals other than marine mammals.

This proposal replaces a June 1999 proposed rule, which was withdrawn. It does not address marine mammals due to their unique requirements for care and handling.

USDA are now seeking comments on the proposal to amend the Animal Welfare Act .