This document specifies a gas chromatographic method with electron capture detection (ECD) for the determination of organochlorine pesticides (OCP s) in animal feeding stuffs. The method is applicable to animal feeding stuffs with a water content up to about 20 % by weight and oil/fatty samples containing residues of one or more of the following OCP s, toxaphene and some of their isomers and degradation products: aldrin; dieldrin; chlordane (as the sum of chlordane isomers and oxychlordane); dichlorodiphenyltrichloroethane (DDT) (as the sum of isomers op'-DDT, pp'-DDT, pp'-TDE (pp'-DDD), and pp'-DDE); endosulfan (as the sum of ±-/²-isomers and endosulfan-sulphate); endrin (sum of endrin and delta-keto-endrin); heptachlor (as the sum of heptachlor and heptachlor epoxide); hexachlorobenzene (HCB); hexachlorocyclohexane isomers ±-HCH (±-BHC), ²-HCH (²-BHC), ³-HCH (³-BHC or lindane); photo heptachlor; cis- and trans-nonachlor; A limit of quantification (LOQ) for the mentioned OCPs of 5 ng/g is intended to be obtained. However, 10 ng/g applies for heptachlor, aldrin, endrin, dieldrin, and endosulfan (±-/² and sulphate). Individual laboratories are responsible for ensuring that the equipment that they use, achieves these limits of quantifications. The LOQs apply to the individual OCPs.