A resource reality of cattle production is that only 10-30% of the nitrogen (N) that is consumed (i.e. fed protein) is utilized by animals for growth, reproduction, milk production, and maintenance needs. Unused N is excreted, primarily in urine. Nitrogen is an essential, valuable plant nutrient, so recycling of N is highly desirable and occurs when urine and feces are applied directly onto soil in a pasture, range or other grazing scenario, or collected manure is applied to cropland.