Lei Mingming, Qu Xiaolu, Dai Zichun, Chen Rong, Zhu Huanxi, Shi Zhendan
Institute of Animal Science, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China.
Key Laboratory of Crop and Livestock Integration, Ministry of Agriculture, Nanjing 210014, China.
Animals (Basel). 2022 May 26;12(11):1364. doi: 10.3390/ani12111364.
In this study, we determined the effects of caponization on the growth performance and carcass traits of Yangzhou ganders. Fifty sham operated geese (the control group) and 80 caponized geese (the caponized group) were selected at 150 days of age and reared until 240 days of age. At 210 days of age, 30 geese from the caponized group were selected and fed with testosterone propionate (testosterone group). The results showed that caponization lowered testosterone and increased the total cholesterol and triglyceride concentrations in serum, live weights, average 15 day gains, and feed intake. Abdominal fat and intramuscular fat were significantly higher in the caponized geese than in the control at 240 days. Gene expression analysis showed that caponization promoted abdominal fat deposition and intermuscular fat content by upregulating the expression of adipogenic genes in the liver, adipose tissue, and muscle tissue. The high expression of in the hypothalamus, liver, and muscle of caponized geese suggests that caponization may lead to negative feedback regulation and leptin resistance. Changes in the expression of these genes, along with the downregulation of in the breast muscle and in the leg muscles, indicate that caponization increases the live weight mainly by increasing fat deposition rather than muscle growth. These results expand our understanding of the mechanisms of caponization on growth performance and fat deposition in ganders.
在本研究中，我们测定了去势对扬州雄鹅生长性能和胴体性状的影响。选取50只假手术处理的鹅（对照组）和80只去势鹅（去势组），于150日龄时挑选并饲养至240日龄。在210日龄时，从去势组中选取30只鹅，用丙酸睾酮进行饲喂（睾酮组）。结果表明，去势降低了睾酮水平，提高了血清中总胆固醇和甘油三酯的浓度、活重、平均15日增重以及采食量。在240日龄时，去势鹅的腹脂和肌内脂肪显著高于对照组。基因表达分析表明，去势通过上调肝脏、脂肪组织和肌肉组织中脂肪生成基因的表达，促进了腹脂沉积和肌间脂肪含量。去势鹅下丘脑、肝脏和肌肉中[具体基因名称未给出]的高表达表明，去势可能导致负反馈调节和瘦素抵抗。这些基因表达的变化，以及胸肌中[具体基因名称未给出]和腿肌中[具体基因名称未给出]的下调，表明去势增加活重主要是通过增加脂肪沉积而非肌肉生长。这些结果扩展了我们对去势对雄鹅生长性能和脂肪沉积机制的理解。
