Effects of Ambient Temperature and Dietary Vitamin E or Ascorbic Acid Supplementation on the Lipid Metabolism of Taiwan Country Chickens
2001
Hochschulschrift
Zugriff:
89
Summary Two trails were carried out to study the effect of ambient temperature and dietary vitamin E (α-tocopherol,coated;VE) or ascorbic acid (L-ascorbic acid,coated;AA) supplementation on growth performance, blood parameters, lipid contents in the liver, hepatic lipogenic-related enzymes activities and muscle fatty acid compositions. Male Taiwan country chickens line B×L2 bred by Dept. of Animal Husbandry, National Chung-Hsing University, were used. Chickens were housed in wire cages in environmental chamber. The trail were divided into two ambient temperature treatments which were (1) constant high temperature (34±1℃) and (2) constant moderate temperature (24±1℃). In trail 1, each temperature treatment was redivided into three treatments which were basal diet treatment, basal diet supplemented with 10 ppm VE and basal diet supplemented with 100 ppm VE. In trail 2, each temperature treatment was redivided into three treatments which were basal diet treatment, basal diet supplemented with 150 ppm VE and basal diet supplemented with 500 ppm AA. Male chickens at 15~35 days old were used in two trails and each treatment was 3 replicates with 5 birds. Feed and water were supplied ad libitum. Experimental period was 3 weeks and a total of 180 male chickens were used. The results of trail 1 indicated that the growth performance of birds raised under constant high temperature were significantly decreased (P<0.05) daily gain and daily feed intake and impaired feed conversion. Birds raised under constant high temperature had significantly decreased (P<0.05) liver weight and relative liver weight (g/100g B.W.) and significantly increased (P<0.05) relative abdominal fat weight (g/100g B.W.). The creatine kinase activity in the plasma significantly increased (P<0.05).The thyroxine level was not significantly different (P>0.05) but it tended to be lower under constant high temperature. The concentration of total lipid and total cholesterol in the plasma and the content of triglyceride in the liver were significantly decreased (P<0.05) and significantly increased (P<0.05) the total cholesterol content in the liver under constant high temperature. The NADP-MDH activity was significantly decreased (P<0.05) and the ATP-CCE and FAS activities were tended to decrease under constant high temperature, however, G6PDH activity had no significantly different between two temperature treatments. Birds raised under constant high temperature significantly decreased (P<0.05) the unsaturated fatty acid / saturated fatty acids ratios of thigh meat. Addition of vitamin E to the basal diet had no significantly effect on the growth performance of Taiwan country chickens. The relative liver weight tended to increase (P<0.05) and the abdominal fat weight tended to decrease (P=0.051) as dietary vitamin E supplementation increased. In the other hand, the thyroxine level in the plasma tended to increase (P=0.052), and the triglycerid and the total cholesterol content were significantly increased (P<0.05) in the liver when birds raised under high temperature. Compared with birds raised under comfortable temperature (24℃), birds raised under high temperature had higher (P<0.05) ATP-CCE and NADP-MDH activities in the liver and unsaturated / saturated fatty acid ratio in the thigh meat. The results of trail 2 for the vitamin E supplementation were similar to the results of trail 1 in temperature treatment for various parameters of birds. AA-suppplemented diet had no significant effect on the growth performance. Regarding the lipid metabolism, addition of 500 ppm AA to the basal diet significantly reduced (P<0.05) the total cholesterol contents in the liver but the other parameters had on significant influence (P>0.05).
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Effects of Ambient Temperature and Dietary Vitamin E or Ascorbic Acid Supplementation on the Lipid Metabolism of Taiwan Country Chickens
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Autor/in / Beteiligte Person: | Liu, Fu-Wen ; 劉福文 |
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Veröffentlichung: | 2001 |
Medientyp: | Hochschulschrift |
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