Abstract: Experiment was conducted to evaluate the effect of superfine grinding tea on growth performance and carcass quality of finishing pigs. 240 Duroc×Landrace×Yorkshire finishing pigs were randomly divided into 4 groups with 60 pigs for each， four diets， which included the control diet(basal diet)，basal diet+05 g·kg-1 tea， basal diet+1 g·kg-1 tea and basal diet+2 g·kg-1 tea，were fed， respectively. The experiment was lasted for 40 day， the feed and pigs were weighted at the beginning and end of the test respectively， the weight gain， daily weight gain and feed to gain ratio were calculated. The backfat thickness， loin eye area， and lean percentage were determined by Piglog 105 ultrasound scanner at the end of growth experiment. 6 pigs (3 male and 3 female) around average weight were slaughtered， the blood samples were collected， the length of carcass， backfat thickness， and loin eye area were measured. Blood sugar， triglyceride， cholesterol， and urea nitrogen of serum were determined. Results showed that there was no difference in growth performances of finishing pigs between treatments. Superfine grinding tea supplement (with 05， 10 and 20 g·kg-1) decreased the backfat thickness of chestwaist by 119 mm， 342 mm (P<005) and 410 mm (P<005)， increased the loin eye area by 970%， 870% and 1007% (P<005)， respectively. The lean percentage also increased， when the ultrasound scanner was used to measure in vivo. Slaughtering experiment indicated that the backfat thickness of chestwaist was decreased by superfine grinding tea supplement(2 g·kg-1 tea supplement group P<005)， there was no difference among treatments that backfat thickness of other point. The lion eye area was increased， triglyceride and cholesterol of serum was decreased significantly by superfine grinding tea supplement (P<005)， blood sugar and urea nitrogen showed no difference among treatments. The results indicated that superfine grinding tea supplement did not influence the growth of finisher， while improved the quality of carcass. The action mechanism of superfine grinding tea may be related with its effect of decreasing serum triglyceride．

Key words: superfine grinding tea, finishing pig, quality of carcass, serum triglyceride