Abstract: Some carcass characteristics of 556 pigs were assayed with Destron PG-100 grading probes and manual grading skill. Prediction models of lean meat percentage of pig carcasses were obtained(Prediction models of automatic grading probes: y=60.325-0.578 x1+0.168 x2, where x1 was fat thickness assayed at the 3/4 last rib, and 6～7cm off the mid-line, while x2 was the muscle depth at the 3/4 last rib, and 6～7cm off the mid-line with R2=0.864 and RSD=2.33%. Prediction models of manual grading skill: y=57.235-0.575 x7+0.207 x10, where x7 was the fat thickness measured at sacrum, and x10 was the muscle depth from muscles gluteus bottom to sacrum. So the technical supports were set up for Pork Carcasses Grading Standard in our country.

Key words:  , PG-100； pig carcass； automatic grading probes； manual grading skill； lean meat percentage； prediction model；