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|標題:||Caponization effects on growth performance and lipid metabolism in Taiwan country chicken cockerels||作者:||Chen, K.L.
|關鍵字:||Taiwan countr chickens;caponization;capon;slip;lipid metabolism;broiler-chickens;lipoprotein profile;skeletal-muscle;malic enzyme;2;strains;testosterone;liver;lipogenesis;castration;propionate||Project:||Asian-Australasian Journal of Animal Sciences||期刊/報告no：:||Asian-Australasian Journal of Animal Sciences, Volume 19, Issue 3, Page(s) 438-443.||摘要:||
This trial was designed to study the caponization effects oil the appearance. carcass characteristics, blood constituents and lipid metabolism of Taiwan country chicken cockerels. Cockerels were caponized at 8 weeks of age, Sixteen-week-old chicken, including 10 capons, 5 slips (incomplete caponized male chickens) and 20 normal chicken of equal sexes were selected for a 10 week ad libitum feeding trial. Results showed that the testosterone concentrations ill the capons and females were lower (p < 0.05) than that of intact males. The comb length. height and weights ere also lower (p < 0.05). The weight of the slips was between that of (fie capons and intact males, but vas heavier (p < 0.05) than that of the capon. The live-weight. carcass weight and shank perimeter in the capons were higher than those of the other groups (p < 0.05). Hepatic lipogenic enzyme activity analysis showed that NADP-malic dehydrogenase (MDH) activity in the capons and female chickens was higher than that in intact male chickens (p-0.05). The MDH activity in the slips was between that for the capon and intact male chickens (p > 0.05). The abdominal fat weight and relative abdominal fat weight of the capons and females were heavier than that for intact males (p < 0.05) the slips were between the capons and intact males, Hie blood lipid content results showed that the triacylglycerol and cholesterol in the capons were higher than that fur intact males (p < 0.05). However. the percentage of low-density lipoprotein (LDL) as lower than that in intact male chickens (p < 0.05)), It appears that the increase in lipid accumulation in caponized male chickens is attributed mainly to an increase in MDH activity and file changes in lipid transportation in the capons.
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