ACTA VETERINARIA ET ZOOTECHNICA SINICA ›› 2016, Vol. 47 ›› Issue (7): 1414-1421.doi: 10.11843/j.issn.0366-6964.2016.07.014

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Effects of Caponization and Ovariectomy on Comb Development,Slaughter Performance and Fat Metabolism in Beijing-you Chickens

CUI Xiao-yan,WANG Jie,LIU Jie,ZHAO Gui-ping,LIU Ran-ran,ZHENG Mai-qing,LI Qing-he,WEN Jie*   

  1. (State Key Laboratory of Animal Nutrition,Institute of Animal Science,Chinese Academy of Agricultural Sciences,Beijing 100193,China)
  • Received:2015-08-24 Online:2016-07-23 Published:2016-07-23

Abstract:

This experiment was conducted to investigate the effects of caponization and ovariectomy on comb development,slaughter performance and fat metabolism in male and female chickens at different weeks,and to provide the reference for industry development of castrated chicken and research on lipid metabolism.Eighty Beijing-you female chickens and eighty Beijing-you male chickens with similar weight were selected at 3 weeks,and divided into control group and gonadectomy group randomly with sham-operated as controls,caponization and ovariectomy as treatments,totally for 4 groups.Comb development,slaughter performance and fat metabolism indexes were examined after slaughter at 13,17 and 22 weeks.After blood and liver samples collected,automatic biochemical analyzer was used to determine triglyceride content in serum,whilst soxhlet extraction methods were used to determine total fat content in liver.Compared with controls,caponization significantly decreased comb length,comb height and comb weight at 13,17 and 22 weeks of male chickens (P<0.05),meanwhile ovariectomy significantly increased comb length,comb height and comb weight at 17 and 22 weeks of female chickens (P<0.05).Caponization and ovariectomy had no significant effect on live weight,carcass weight,dressing percentage,percentage of breast muscle and thigh muscle at 13 weeks of chickens (P>0.05).Additionally,caponization had no significant effect on live weight at 17 and 22 weeks of male chickens (P>0.05),but capons had lower percentage of thigh muscle at 17 and 22 weeks and exhibited higher percentage of breast muscle at 17 weeks and higher percentage of abdominal fat at 13,17 and 22 weeks than those in control (P<0.05).Ovariectomy significantly increased live weight,carcass weight and dressing percentage at 17 weeks and percentage of abdominal fat at 17 and 22 weeks than those in control (P<0.05).The triglyceride content in serum and total fat content in liver of capons were significantly higher than those in control at 13,17 and 22 weeks (P<0.05).Ovariectomized group exhibited significantly higher content of triglyceride in serum at 17 weeks and total fat content in liver at 17 and 22 weeks of female chickens than those in control (P<0.05).The results indicate that caponization significantly inhibited comb developing of male chickens and ovariectomy significantly promoted comb development.Caponization had no influence on live weight at different weeks but significantly reduced percentage of thigh muscle,and increased percentage of abdominal fat.Ovariectomy increased live weight and percentage of abdominal fat to some extent.Finally,gonadectomy might promote abdominal fat deposition of chickens by increasing the content of serum TG and total fat in liver.

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