Enzyme Activities Related to Lipid Metabolism in the Liver and Adipose Tissue of Tsaiya Ducks under Fasting and Ad libitum Feeding Conditions

  • Lien, Tu-Fa (Department of Animal Science, National Chiayi University) ;
  • Jan, Der-Fang (Department of Animal Science, College of Agriculture, National Chung Hsing University)
  • Received : 2002.09.02
  • Accepted : 2002.12.04
  • Published : 2003.03.01


The study investigated the lipid metabolism of Tsaiya ducks under fasting and ad libitum feeding conditions. Sixty Tsaiya ducks in their growing period (8-12 wk-old) and sixty Tsaiya ducks in their laying period (26-30 wk-old, 10-14 weeks after the onset of laying) were randomly divided into ad libitum feeding and 3-day fasting groups. The activities of lipid metabolism related enzymes were determined. Experimental results indicated that fasting depressed the activities of lipogenesis related enzymes such as fatty acid synthetase and NADP-malic dehydrogenase in both periods (p<0.05). Fasting also increased the activities of liver fatty acid $\beta$-oxidation enzymes (p<0.05). However, the activities of lipoprotein lipase in adipose tissue, heart and ovarian follicle in both periods and the hormone-sensitive lipase of adipose tissue in the growing period were decreased by fasting (p<0.01).


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