This document provides procedures for determining the proximate analysis of feeds, including moisture content, ash content, crude protein content, ether extract, and crude fibre. Moisture content is determined by drying a feed sample to a constant weight. Ash content is measured by igniting the remaining dry matter in a furnace. Crude protein content is quantified using the Kjeldahl method of digestion, distillation, and titration. Ether extract is extracted from the sample using Soxhlet extraction with diethyl ether. Crude fibre is determined by sequential boiling and filtering of the sample with acid and base solutions.