An official website of the United States government Here's how you know Agricultural Research Service U.S. DEPARTMENT OF AGRICULTURE Research Media About ARS Work With Us ARS Home About ARS Contact Us Dairy farmers now have a new mobile app that measures milk urea nitrogen--a compound in milk that can be analyzed to determine how effectively dairy cattle are processing the protein in their feed. This may become a key tool to reduce expenses and limit pollution. Learn more I Want To - choose - Find Axon (REE Employees Only) Find a person Find a location Get nutrition information Find a research project Find a scientific manuscript Work with ARS Trending Topics - choose - ORAC Axon (REE Employees Only) Safe Food Seeds Apple Vitamin K Bees Honey Fiber New Site for Science-Minded Students New Biocontrol Agent for the Tree-of-Heaven Featured Tellus Content: Solving the Biggest Agricultural Challenges Through Data Innovation . ARS Research In Your State - choose - Alabama Alaska Arizona Arkansas California Colorado Connecticut Delaware District of Columbia Florida Georgia Hawaii Idaho Illinois Indiana Iowa Kansas Kentucky Louisiana Maine Maryland Massachusetts Michigan Minnesota Mississippi Missouri Montana Nebraska Nevada New Hampshire New Jersey New Mexico New York North Carolina North Dakota Ohio Oklahoma Oregon Pennsylvania Puerto Rico Rhode Island South Carolina South Dakota Tennessee Texas Utah Vermont Virginia Washington West Virginia Wisconsin Wyoming Headquarters Offices - choose - Administrative and Financial Management Home Page Administrative and Financial Management Staff Budget and Program Management Staff Information Technology Services Home Page Information Technology Services Staff Legislative Affairs Home Page Legislative Affairs Staff Office of the Administrator Office of Communications Home Page Office of Communications Staff Office of Outreach, Diversity, and Equal Opportunity Home Page Office of Outreach, Diversity, and Equal Opportunity Staff Office of Scientific Quality Review Home Page Office of Scientific Quality Review Staff Office of Technology Transfer Home Page Office of Technology Transfer Staff Research Media About ARS Work With Us Connect with ARS Sign up ARS Home USDA.gov Plain Writing Policies & Links Civil Rights Statements FOIA Accessibility Statement Privacy Policy Non-Discrimination Statement Quality of Information USA.gov WhiteHouse.gov Close subscription dialog Sign up here with your email address for the latest news and updates from the USDA Agricultural Research Service! No Thanks Remind Me Later