PORTLAND, Ore. (AP) — Oregon's governor has signed a bill requiring eggs produced by commercial farms to eventually be cage-free.

The Oregonian/OregonLive reported Tuesday that Gov. Kate Brown approved the new law mandating all eggs produced or sold in Oregon must come from cage-free hens by 2024.

The measure signed Monday applies to commercial farms with 3,000 or more chickens.

The state requirements will give about 4 million birds added space and perches.

The Humane Society of the United States called the law a "monumental win for hens confined in tiny cages in the egg industry."

Oregon joins a handful of other states with similar laws including California, Washington and Massachusetts.

The newspaper cites reports that say cage-free laws provide an improvement for chickens, but most remain held in small spaces and cages.

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Information from: The Oregonian/OregonLive, http://www.oregonlive.com