Grain and cattle futures end mostly lower Monday.  Kevin Duling, KD Investors, says more tariff talk over the weekend on the BRICS countries has funds nervous and that sent the dollar higher which is also negative for ag markets.  Despite positive export news including another 4.9 million bu. of soybeans sold to China, the soybean market has failed to rally.  Rain over the weekend in Brazil and record crop forecasts for South America are weighing on the soybeans and products.  Wheat is down into contract lows again on more technical selling and despite lower production and export forecasts from Russia.  Duling says there is disconnect between the cash and futures and cash will have to sort it out as it bids for quality.  Corn is more of a follower of wheat and even soybeans despite solid demand.  Cattle set back on rumors of a plant closing in Kansas at a corned beef plant and despite higher cash and cutouts.