"The United Egg Producers and the Humane Society of the United States worked for over a year to reach this compromise, and I believe it is one that strikes a very fair balance," Feinstein said last month. "Producers must enlarge cages for egg-laying hens and allow space for the birds to engage in natural behaviors such as nesting and perching."

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Both the bill and the amendment set minimum floor space requirements per hen, and would phase in these requirements over 18 years. It would also prohibit excessive levels of ammonia in hen houses and require humane euthanasia of spent hens.

The HSUS issued a statement on Tuesday calling for the adoption of the amendment by the Senate.

"It's my hope that senators break free of the old paradigm — animal advocates versus agriculture industries — and recognize that this solution serves all parties, especially consumers," HSUS CEO Wayne Pacelle said. "Failure to enact this provision will mean that the egg industry and animal advocates will go back to costly state-by-state battles that will slow down progress, cost both sides hundreds of millions of dollars and leave all parties with uncertain outcomes."

Sens. Richard Blumenthal (D-Conn.), Scott Brown (R-Mass.), Maria CantwellMaria Elaine CantwellHillicon Valley: Democratic state AGs sue to block T-Mobile-Sprint merger | House kicks off tech antitrust probe | Maine law shakes up privacy debate | Senators ask McConnell to bring net neutrality to a vote Hillicon Valley: Democratic state AGs sue to block T-Mobile-Sprint merger | House kicks off tech antitrust probe | Maine law shakes up privacy debate | Senators ask McConnell to bring net neutrality to a vote Senators call on McConnell to bring net neutrality rules to a vote MORE (D-Wash.), Jeff MerkleyJeffrey (Jeff) Alan MerkleyDemocratic White House hopefuls push to expand health care in US territories Democratic White House hopefuls push to expand health care in US territories Hillicon Valley: Assange hit with 17 more charges | Facebook removes record 2.2B fake profiles | Senate passes anti-robocall bill | Senators offer bill to help companies remove Huawei equipment MORE (D-Ore.), David VitterDavid Bruce VitterSenate confirms Trump judge who faced scrutiny over abortion views Collins votes against Trump judicial pick Progressive group targets Susan Collins over Trump judicial pick MORE (R-La.) and Ron WydenRonald (Ron) Lee WydenOn The Money: Pelosi says no debt ceiling hike until deal on spending caps | McConnell pressures White House to strike budget deal | Warren bill would wipe out billions in student debt | Senate passes IRS reform bill On The Money: Pelosi says no debt ceiling hike until deal on spending caps | McConnell pressures White House to strike budget deal | Warren bill would wipe out billions in student debt | Senate passes IRS reform bill Senate passes bipartisan IRS modernization bill MORE (D-Ore.) sponsored Feinstein's original bill. But the amendment to the farm bill also has the support of Sens. Susan CollinsSusan Margaret CollinsThe Hill's Morning Report — Uproar after Trump's defense of foreign dirt on candidates The Hill's Morning Report — Uproar after Trump's defense of foreign dirt on candidates Democratic challenger to Susan Collins announces Senate bid MORE (R-Maine), John KerryJohn Forbes Kerry'Landslide' for Biden? A look at 40 years of inaccurate presidential polls Trump campaign considering making a play for blue state Oregon: report Trump campaign considering making a play for blue state Oregon: report MORE (D-Mass.), Joe Lieberman (I-Conn.), Patty MurrayPatricia (Patty) Lynn Murray It's time to let Medicare to negotiate drug prices Ocasio-Cortez shares verse by the 'Congressional Destiny's Child' in promotion of new birth control legislation Ocasio-Cortez shares verse by the 'Congressional Destiny's Child' in promotion of new birth control legislation MORE (D-Wash.), Bernie SandersBernie SandersKamala Harris rallies with McDonald's workers striking for higher wages Kamala Harris rallies with McDonald's workers striking for higher wages Playing fast and loose with the economic facts MORE (I-Vt.) and Robert MenendezRobert (Bob) MenendezThere is a severe physician shortage and it will only worsen Democrats ask Fed to probe Trump's Deutsche Bank ties Ending the Cyprus arms embargo will increase tensions in the Eastern Mediterranean MORE (D-N.J.).

Senators are currently working on an agreement on which amendments to the bill might be considered.