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PBSTRACT: Five slopes representative of the "dehesa" grassland comrnunities in the semi-arid zones of Central-Western Spain (province of Salamanca) were studied. Above-ground biomass production was recorded from April to June and the NDF (neutral detergent fibre), ADF (acid detergent fibre), hemicellulose, cellulose, lignin, and digestibility were determined in the dry matter. Principal component analysis was applied to the data. The changes with time along the growth period show a paralleldoi:10.1080/00103629409369171 fatcat:ehcpap3wkndyzdjbpktrrvzrzi