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Dutch institutes dealing with production figures for mineral excretion by animal husbandry installed a working party to standardize their excretion figures. The working party developed a calculation scheme based on a mass balance over the animal. Excreted minerals = minerals in feed - [Bnerals in products (meat, milk, eggs). Special attention is paid to the calculation of the averaged annual feed intake and its N, P and K content. This publication of the working party describes the calculation scheme for cattle, sheep and goats and presents the figures for the annual N, P and K excretion and the annual amount of manure for the years 1990, 1991 and 1992. The publication is a joint product of CBS, IKC-Veehouderij, LAMI, LEI-DLO, RIVM and Landelijke Mestbank.