Emergency Agricultural Disaster Assistance Act of 2003

Emergency Agricultural Disaster Assistance Act of 2003 - Directs the Secretary of Agriculture to provide: (1) emergency financial assistance to agricultural producers who have incurred qualifying 2001 or 2002 crop losses due to weather or related conditions; and (2) payments to livestock producers who have incurred 2001 and 2002 losses in an emergency-designated county, with set-asides for the American Indian livestock program.

Amends the Harmonized Tariff Schedule of the United States to impose tariff-rate quotas (quantitative import limits) and provide various duty rates on certain casein, caseinates, milk protein concentrate, and other casein derivatives and glues imported into the United States (except imports from Mexico).

Authorizes the President to: (1) enter into a trade agreement with a foreign country to grant new concessions as compensation in order to maintain the general level of reciprocal and mutually advantageous concessions; and (2) proclaim any necessary modification or continuance of any existing duty, or continuance of existing duty-free or excise treatment. Sets forth certain limits on the reduction of duties on such products.

Biodiesel Renewable Fuels Act - Amends the Internal Revenue Code to: (1) allow a tax credit of between 3 and 20 cents per gallon for soy or specified vegetable based biodiesel fuel mixtures; and (2) make corresponding reductions to motor fuel excise taxes.

Amends the Energy Policy Act of 1922 to set forth Federal agency (except the Department of Defense) purchasing requirements for ethanol-blended gasoline and biodiesel for use in agency vehicles.