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while others consume excessive amounts. Deviation from the targeted supplement intake can negatively impact animal production. Interpretation of data from grazing trials with supplementary feeding is difficult due to the lack of information concerning the quantity of supplement consumed by each animal in a group-feeding situation (Nolan et al., 1975). Researchers have looked at individual intake of protein and energy supplements (Curtis et al., 1994), but few studies have evaluated variation in individual consumption of mineral. Lobato and Pearce (1980) reported that confinement of sheep that had not licked molasses-urea blocks under grazing conditions increased the proportion of animals licking the blocks.