Effect of dietary energy and protein levels on growth, body composition, and fatty acid synthesis in fattening period of meat-type ducks
2001
Zhou, C.H. (Gifu Univ. (Japan)) | Ohtani, S. | Tanaka, K.
This study was conducted to determine the effect of dietary ME and CP levels on growth performance, body composition and fatty acid synthesis in meat-type ducks. A combination of ME (2.80, 3.00 and 3.20Mcal/kg) and CP (10%, 16% and 18%) in the diets were given to ducks from 15 to 42 days in a 3*3 factorial design. Body weight gain increased as increasing dietary ME and CP contents. Increasing dietary CP content improved feed conversion ratio when ducks given diets containing ME3.00 and 3.20Mcal/kg. The percentage of abdominal fat weight increased as dietary ME increased and decreased as dietary CP increased. There are positive relationships between abdominal fat and activities of lipogenic-related enzymes in liver. The activities of glucose-6-phosphate dehydrogenase (G-6-PDH) and NADP-malate dehydrogenase(NADP-MDH) decresed as inreasing dietary CP level. The activity of G-6-PDH corresponded with 55-90% of NADP-MDH activities. This result suggested that NADPH, which are necessary for synthesis of fatty acid, are produced by pentose-phosphate pathway as well as pyruvate-malate cycle in the liver of ducks.
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