The paper presents results from the comparative studies upon methods of industrial fodder mixtures homogeneity evaluation. Competence of participating laboratories to make a legal control within that issue was confirmed. Achieved results on the mixing level (variability coefficient) of fodder mixtures for turkeys and swine were lower than 10% – limit value. Reproducibility limits of results achieved by two laboratories determining chlorides and calcium within legal control were set for 5% (chlorides) and 3% (calcium). Acceptance of expanded uncertainty at the same level as uncertainty of analytical methods was recommended.