"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 CantwellDemocrats oppose effort to delay or repeal Interior methane rule Senators spar over proposal to drill in Alaska wildlife refuge Fake quorum calls are an excuse for the Senate's inaction MORE (D-Wash.), Jeff MerkleyJeffrey (Jeff) Alan MerkleyDems mull big changes after Brazile bombshell Dems push clearer GMO labeling Dems cheer Flake after scathing Trump speech MORE (D-Ore.), David VitterDavid VitterYou're fired! Why it's time to ditch the Fed's community banker seat Overnight Energy: Trump set to propose sharp cuts to EPA, energy spending Former La. official tapped as lead offshore drilling regulator MORE (R-La.) and Ron WydenRonald (Ron) Lee WydenLobbying World Overnight Regulation: House to vote on repealing joint-employer rule | EPA won't say which areas don't meet Obama smog rule | Lawmakers urge regulators to reject Perry plan New tax plan will hinder care for older Americans MORE (D-Ore.) sponsored Feinstein's original bill. But the amendment to the farm bill also has the support of Sens. Susan CollinsSusan Margaret CollinsBipartisan group of lawmakers aim to reform US sugar program A bipartisan bridge opens between the House and Senate Gaming the odds of any GOP tax bill getting signed into law MORE (R-Maine), John KerryJohn Forbes KerryKerry: Trump's rhetoric gave North Korea a reason to say 'Hey, we need a bomb' Russian hackers targeted top US generals and statesmen: report Trump officials to offer clarity on UN relief funding next week MORE (D-Mass.), Joe Lieberman (I-Conn.), Patty MurrayPatricia (Patty) Lynn MurrayA bipartisan bridge opens between the House and Senate Overnight Health Care: ObamaCare sign-ups surge in early days Collins, Manchin to serve as No Labels co-chairs MORE (D-Wash.), Bernie SandersBernard (Bernie) SandersWorld leaders reach agreement on trade deal without United States: report Sanders on Brazile revelations: DNC needs ‘far more transparency’ Sen. Warren sold out the DNC MORE (I-Vt.) and Robert MenendezRobert (Bob) MenendezIn judge's 2010 Senate trial, Menendez was guilty of hypocrisy Excused Menendez juror: 'I don't think he did anything wrong' We don't need a terrorist attack to know diversity program has to go MORE (D-N.J.).

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