The USDA ARS said that it would no longer use cats for any research and adopt out the 14 cats remaining at its laboratories. Since no other USDA department conducts experiments on cats, that means cat testing at the USDA is officially over, Goodman told the Huffington Post via email.

Outcry over the experiments first erupted in 2018, when the White Coat Waste Project revealed the details of the parasite experiments that had been conducted since 1982. As the White Coat Waste Project summarized in the 2019 report:

The currently approved protocol for this project calls for up to 100 kittens to be bred each year at ARS's Animal Parasitic Disease Laboratory (APDL) in Beltsville, Maryland. At eight weeks old, the kittens are fed raw meat infected with the Toxoplasma gondii (T. gondii) parasite, and their feces is collected for up to 3 weeks so experimenters can harvest oocysts (eggs) for use in food safety experiments. These healthy kittens — who briefly pass the parasite's eggs and become immune within weeks — are then killed and incinerated by USDA because they are no longer useful.

The White Coat Waste Project said the experiments had cost the lives of more than 3,000 cats and $22.5 million in tax payer funds. The 2018 report led both the House and Senate to introduce bi-partisan legislation to stop the killings.

"The USDA made the right decision today, and I applaud them for their willingness to change course," Democratic Oregon Senator Jeff Merkley, who introduced the Senate version of the bill, said in a statement reported by NPR. "It's a good day for our four-legged friends across America."

The ARS had been conducting the experiments because the parasite causes toxoplasmosis, a major cause of death from foodborne illness in the U.S. Cats are the only host animal in which the parasite can complete its life cycle and produce eggs. However, ARS said in its statement that its researchers had achieved their objectives from the experiments. They had not infected any cats with the parasite since September 2018.

"We are continually assessing our research and priorities and aligning our resources to the problems of highest national priority. We are excited for the next chapter of work for these scientists and this laboratory," ARS Administrator Dr. Chavonda Jacobs-Young said in the statement.