598816 A method for the management of animals grazing in a pasture, comprising feeding a marker labelled supplement to grazing animals. Monitoring consumption of the marker labelled supplement by the animals to generate supplement consumption data tor the animals. Measuring physical characteristics of the animals to generate physical characteristic data for the animals. Collecting faecal samples from the animals. Analysing the faecal samples, samples of the pasture and the supplement to generate faecal data, pasture data and supplement data. Then, processing the supplement consumption data, the physical characteristic data and the faecal data, pasture data and supplement data to determine individual animal diet and nutritional information for animal management purposes.
