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High-lean gain swine initially averaging 85 kg were assigned to 96 individual pens and given one of six diets ranging in the ratio of Total Ileal Digestible (TID) Lysine:Metabolizable Energy (ME) of 1.23 to 2.28 g/MCal. Pigs and feed intake were weighed weekly and backfat was measured on two week intervals. Blood samples were drawn initially and at the final weighing, then analyzed for plasma urea nitrogen. Animals were marketed at 120 kg and packer carcass data were obtained. A second experiment used ninety-six 81 kg individually penned barrows at an environmental temperature of 28 30C and fed one of four diets containing 1.89 g TID Lysine/MCal ME with 0 to 6% dietary fat. Animal weights, feed intake, and slaughter data were collected as in experiment I. The optimal TID Lysine/ME ratio (1.89 g/MCal) was based on performance data, slaughter data, and circulating levels of plasma urea nitrogen. The optimal level of dietary fat for this high-lean gain population was near 4% for the 28-30C environmental temperature. This was based on performance and slaughter data.