Abstract: The aim of the study was to investigate the effects of dietary energy levels on lipids metabolic enzymes of liver and adipose tissue in Wujin pigs. Fifty-four Wujin pigs were randomly allotted into three groups fed diet containing different energy levels, there were eighteen pigs in each group with three replicates, six pigs were used in per replicates. Wujin pigs fed on the dietary protein levels were 18%,16%, 14% and 16%,14%, 12% and 14%,12%, 10% during the growth stages of 15 to 30,30 to 60 and 60 to 100 kg body weight, respectively, during the growth stages of 15 to 30,30 to 60 and 60 to 100 kg body weight, the dietary trace element contents in one group were constant. At the body weight of 30, 60 and 100 kg, Wujin pigs were slaughtered and liver and back subcutaneous fatty tissue were taken for analyzing contents of lipase(LPS), glucose-6 phosphate dehydrogenase (G-6-PDH) and malate dehydrogenase(MDH). The results showed that the contents of LPS,G-6-PDH and MDH in liver and back subcutaneous fatty tissue of Wujin pigs were not affected significantly by the dietary energy level at 30 kg body weight (P>0.05). At 60 and 100 kg body weight, the contents of LPS in liver and back subcutaneous fatty tissue of Wujin pigs fed on the high energy level dietary were significantly higher than the low energy level dietary(P<0.05), and, the contents of LPS,G-6-PDH and MDH in liver and back subcutaneous fatty tissue of Wujin pigs fed on the high energy level dietary were significantly lower than the low energy level dietary (P<0.05). The results indicated that higher energy level of dietary could increase endogenous energy release, body fat deposition ratio influenced in Wujin pigs at growth midanaphase.

Key words: Wujin pigs; dietary energy level; fat metabolism; enzyme