DES MOINES, Iowa -- National Pork Producers Council President-Elect Randy Spronk, a producer from Pipestone, Minn., says livestock producers should be watching the Chesapeake Bay developments closely.  Spronk says the Environmental Protection Agency’s nutrient regulations for the bay area will be the model for the Mississippi River watershed. Depending on how that unfolds, it could have dramatic impacts on pork producers and others.