The Data Reporting Guideline (DRG) for Metabolism (Qualitative Nature of the Residue): Food Animals, Series 171-4(a)(3), gives guidance to pesticide registrants on the format of their study report so that the Agency can review it efficiently. The guidance clarifies sections in the existing Pesticides Assessment Guidelines, Subdivision O, on data reporting. It provides an outline for the study report and describes the topics which should be addressed such as dosing of radiolabeled materials, housing and health of animals, sample collection, characterization of the radioactivity, etc., and provides guidance on the presentation of the results of the study. Data submitters can use the DRG in preparing their reports for submission to EPA to meet 40 CFR 158 requirements for the registration of pesticides.