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A 6-year grazing study on sub-clover pasture at the UC Hopland Field Station indicated that lambs weaned at 40 Ib made excellent gains. Phosphorus and sulfur fertilization enhanced the gains enough to be profitable. By concentrating lambs on highly productive, well-protected pastures, researchers not only used inputs more efficiently, they also prevented many of the predator losses encountered in nearby, less-protected pastures.