Interannual variability in neon flying squid [Ommastrephes bartrami] abundance and oceanographic conditions in the central north Pacific, 1982-1992
1996
Yatsu, A. (National Research Inst. of Far Seas Fisheries, Shimizu, Shizuoka (Japan)) | Watanabe, T.
The experiment was to determine influence of dietary protein, sulfur amino acid levels, and their ratio on activities of malic enzyme (ME), fatty acid synthetase (FAS) in liver and hormone sensitive lipase (HSL) in adipose tissue in broiler chicks in order to estimate changes in lipogensis and lypolysis by them. Male broiler chicks (7 days of age) were given diets containing 2 levels of dietary protein (20 and 30%) with 4 different SAA contents for 14 days ad libitum. The 20% CP diet containing either 0.60, 0.70, 0.80 or 0.90% SAA, and the 30% CP diets containing either 0.90, 1.05, 1.15 or 1.35% SAA were formulated to achieve the ratio of SAA to CP in the diets at 0.030, 0.035, 0.040 and 0.045, respectively, by addition of DL-methionine. Hepatic ME and FAS activities in chicks fed the 20% CP diets were greater than those in chicks fed the 30% CP diets. Among the 20% CP diet-groups, the 0.60% SAA diet had higher ME activity as compared to the other 3 diets, whereas no significant difference in ME activity was observed among the 30% CP diet-groups. The lowest activity of FAS was observed in chicks fed the 0.90% SAA diet in both CP diets. The highest activity of hormone sensitive lipase (HSL) was observed at 0.035 of SAA/CP ratio in both dietary CP groups. There were no significant differences between dietary CP levels in terms of HSL activity. The results suggested that the regulation of ME and FAS in liver, related to lipogensis, by dietary SAA would be dependent on dietary CP levels, and that the SAA/CP ratio rather than dietary CP levels in the diet is an important factor controlling HSL in adipose tissue, associated with lypolysis
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