new york/chicago u.s. regulators new presidential administration institute freeze rule key country farm belt agricultural group say tuesday heighten uncertainty regions help propel donald trump office environmental protection agency epa delay implementation year biofuels requirements along 29 regulations finalize last weeks barack obama presidency accord government notice u.s. department agriculture pause rule affect livestock group say epa usda representatives respond request comment freeze prompt worry rural communities tuesday though source say delay unheard new administration trump nearly two-thirds rural vote november big agricultural state line republican decade-old renewable fuel standard rfs stymie regulatory delay years past face uncertainty new administration include propose epa chief critic program rfs aim reduce greenhouse gas emissions reliance import oil require oil company blend increase amount biofuels corn-based ethanol gasoline diesel refiners fail must buy paper credit oil industry hearten news oil industry lobby heavily change repeal policy regulatory freeze implement president trump change statutory compliance rfs provide opportunity take close look fundamentally flaw policy say chet thompson president american fuel petrochemical manufacturers represent company include oil refiners price paper credit use fuel company prove meet requirements drop sharply news fall low level since november 2015. renewable fuel association represent biofuels producers say expect procedural delay lead significant change requirements delay fuel rule implement march 21 accord federal register notice third 13.6 billion bushel corn produce unite state 2015 use make fuel ethanol accord national corn growers association usda put regulatory freeze everything pipeline say dave warner spokesman national pork producers council agency put hold new rule formerly say would help protect meat producers mistreatment pack company processors say pork council oppose measure say necessary freeze also affect new rule would first time mandate specific space requirements hens lay organic egg warner say u.s. cattlemen association say delay implement usda rule involve meat packers worrisome group represent cattle producers support measure need prevent anti-competitive buy practice immediately clear usda rule would implement certainly edge right hope review trump administration see value rule say lia biondo association policy outreach coordinator trump freeze u.s. agencies delay rule affect farm towns