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Animal production systems in the southwest of the Iberian Peninsula are characterized by extensive livestock farming. Data for the present study were collected during a survey in the year 2000 from 96 dehesa (Semiarid rangelands in the southwest of Spain) sheep farms in Extremadura (region of SW Spain), following a randomized sampling design for a confidence level of 95%. We studied the stocking rate effects on a number of economic indicators for each farm. The sample involved a total of 96 093 sheep, in an area of 61 391 ha. The data were analysed for three stocking rate levels: low (<0.25 Livestock Units (LU)/ha), medium (0.25-0.5 LU/ha), and high (0.5 LU/ha). The differences were compared by analysis of variance, following the GLM procedure.
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