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Effects of Laying Period Modulation and Different Photoperiods on Lipid Metabolism of White Roman Breeder Geese
|關鍵字:||geese;鵝;laying period modulation;different photoperiods;lipid metabolism;產期調節;光照處理;脂質代謝||出版社:||畜產學系||摘要:||
The Purpose of this study was conducted to investigate the effects of laying period modulation and different photoperiods on lipid metabolism of White Roman breeder geese. In experimental 1, three treatments, in laying season geese, laying period modulated geese and out of laying season geese, were designed. Six geese were selected for each treatment and the blood and liver were collected form each bird. Plasma were determined for the concentrations of estradiol, progesterone, glucose and various fractions of lipid . Liver were determined for the contents of various fractions of lipid, the activities of lipogenic-related enzymes and fatty acid profiles. The abdominal fat was removed from each bird for analysis of the composition of fatty acids. The oviduct weight and length were also determined. In experiment 2, sixty laying geese were used and divided into 2 treatments with three replicates of 10 birds. The geese of two treatments received short lighting length (10L:14D) and long lighting length (20L:4D), respectively. Water and feed were supplied ad libutum. Feed intake and egg production were recorded weekly for a 8-wks experimental period. Five birds were selected and sacrificed at 0, 2, 4 and 8 wks. The samplings and analyses were same as the experiment 1. The results of experiment 1 indicated that the concentrations of triglyceride and total lipid in the plasma and liver;the concentrations of glucose and E2 in the plasma;the activities of lipogenic-related enzymes including acetyl-CoA carboxylase (ACC), NADP-malate dehydrogenase (NADP-MDH) and glucose-6-phosphate dehydrogenase (G-6-PDH) in the liver, and the contents of monounsaturated fatty acids in the liver and in the abdominal fat of in laying season geese and laying period modulated geese were higher than those of out of laying season geese (P<0.05). Statistically significant positive correlations were observed between concentrations of E2 in the plasma and glucose in the plasma, triglyceride (P<0.01) and total lipid in the plasma and liver, and the activities of hepatic ACC, NADP-MDH (P<0.01) and G-6-PDH (P<0.05). In experiment 2, feed intake, egg production, the concentrations of various lipid in the plasma and in the liver, glucose, estradiol and progesterone in the plasma, the activities of hepatic lipogenic-related enzymes, and fatty acid profiles in the liver and in the abdominal fat of 10L:14D lighting treatment did not change significantly through the experimental period. In 20L:4D experimental treatment, the concentrations of glucose, E2 and P4 in the plasma, and triglyceride and total lipid in the plasma and liver (P<0.05), the activities of ACC in the liver, and the ratios of monounsaturated fatty acids in the liver and in the abdominal fat reduced gradually with the experimental period (P<0.05). In addition, the egg production of 20L:4D tended to decreased gradually with the experimental periods. According to the results of the experiments, the short lighting length may stimulate the secretion of estradiol and then affect lipid metabolism in the liver of geese during laying period.
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