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Genetic parameters for performance traits in a pig population were estimated using a multi-trait derivative-free REML algorithim. The 2590 total data included 9222 restrictively fed male and 1668 ad libitum fed female records. Estimates of heritability were 0.25 (0.O3),0.15 (0.03), and 0.30 (0.05) for lifetime daily gain, test daily gain, and P2 fat depth in males, respectively: and 0.27 (0.04) and 0.38 (0.05) for average daily gain in females respectively. The genetic correlation between P2 fat depth and test daily gain in males was -0.17 (0.06) and between P2 fat and lifetime average daily gain in females 0.44 (0.09). Genetic correlations between sexes were 0.71 (0.11) for average daily gain and -0.30 (0.10) for P2 fat depth. Genetic response per standard deviation of selection on an index combining all traits was predicted at $AU120 per sow per year. Responses in daily gain and backfat were expected to be higher when using only male selection than when using only female selection. Selection for growth rate in males will improve growth rate and carcass leanness simultaneously. \ud\u

Genetic parameters and predicted response to selection for lean growth in an Australian commercial nucleus pig herd