The U.S. government said Wednesday it will substantially reduce the use of chimpanzees in biomedical research and send into retirement most of the 360 chimpanzees it currently owns or supports.

The National Institutes of Health (NIH) said it accepted most of the recommendations made by an independent advisory council for the use of chimpanzees in NIH-funded research.

It will retain but not breed about 50 chimpanzees for future biomedical research, the NIH said, adding that the rest 310 chimpanzees designated for retirement could eventually join more than 150 others already in sanctuaries.

Francis Collins, director of the NIH, said that he believed greatly reducing the use of chimpanzees in biomedical research is "scientifically sound and the right thing to do."

"New scientific methods and technologies have rendered their use in research largely unnecessary," Collins said in a statement.

"Their likeness to humans has made them uniquely valuable for certain types of research, but also demands greater justification for their use," he said.

One recommendation the NIH did not accept was that the living space of chimpanzees should be at least 1,000 square feet (93 square meters) per animal.

The federal agency said that there remains a lack of scientific consensus on the issue and that it plans to engage chimpanzee behavior and facilities experts to determine the appropriate minimum space requirement for research chimpanzees.

Earlier this month, the U.S. Fish and Wildlife Service announced a proposal to classify both wild and captive chimpanzees as endangered. Endi

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