A federal appeals court on Friday removed a temporary ban on domestic horse slaughter, clearing the way for companies in New Mexico, Missouri and Iowa to open while an appeal of a lawsuit by animal protection groups proceeds.

The 10th U.S. Circuit Court of Appeals in Denver lifted the emergency injunction it issued in November after The Humane Society of the United States and others appealed the ruling of a federal judge in Albuquerque. The judge said the U.S. Department of Agriculture followed proper procedure in issuing permits to Valley Meat Co. in Roswell, N.M., Rains Natural Meats of Gallatin, Mo., and Responsible Transportation in Sigourney, Iowa.

The appeals court's order Friday said the groups had "failed to meet their burden for an injunction pending appeal."

Blair Dunn, an attorney for Valley Meat and Rains Natural Meats, said the order lifts the emergency status of the case, meaning it will likely be months before a final decision is issued.

Dunn said the plants are ready to open, although they could agree to remain shuttered if the plaintiffs agree to post a sufficient bond to cover the companies' losses should they ultimately prevail.