Radiographic evidence for changing patterns of animal exploitation in the Southern levant

Radiographs were taken of sheep (Ovis aries) and goat (Capra hircus) metacarpals from archaeological sites in Israel dating from the Pre-Pottery Neolithic B (PPNB) to recent times. From these radiographs the combined cortical thickness (CCT) of the bones was measured, and used to estimate sample variation in bone mass. The samples were compared by species and period, and further compared with CCT values obtained for a recent sample of ibex (Capra ibex nubiana) from the same region. For all periods studied, CCT values in goats were comparable with those of recent ibex. A significant reduction in CCT values of both sheep and goats was found in the Early Bronze to recent samples as compared with the Chalcolithic and PPNB samples. It is proposed that this reduction in CCT values is associated with the presence of older, female animals in the later samples studied, and may be indicative of an emphasis on milk herds.