Korean Journal of Poultry Science (한국가금학회지)

The Korean Society of Poultry Science (한국가금학회)
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Effect of Induced molting on the Relative Weights and Hormone Levels of Thyroid, Ovary, and Adrenal Glands in Spent Laying Hens

산란노계에서 강제환우가 갑상선, 난소, 부신 및 호르몬 수준에 미치는 영향

  • M. Akram (Research Center for Industrial Development of Biofood Materials, Chonbuk National University) ;
  • rahman, Zia-ur (Dept. of physiology and pharmacology, University of Agriculture) ;
  • C.S. Na (Institute of Industrial Technology, Iksan National College) ;
  • Kim, S.H. (National Livestock Research Institute, Daejeon) ;
  • K.S. Ryu (Research Center for Industrial Development of Biofood Materials, Chonbuk National University)
  • Published : 2002.12.01
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Abstract

A study was conducted to investigate the effect of induced molting on the relative weight and hormone levels of thyroid, ovary, and adrenal glands in spent laying hens. Three hundred sixty 77-wk-old, Babcock White hens were divided into 36 experimental units of 10 hens each and induced to molt for seven weeks. A diet containing 16% CP and 2,800 kcal ME/kg was fed ad libitum from 84 to 126 weeks of age. Thirty-six birds were randomly selected for blood collection and slaughtered at Pre-molt, 5% egg Production, Peak, and end Phase of the egg Production. Weights of the thyroid, ovary, adrenal glands, and plasma T3, T4, cortisol, and estradiol contents were measured at each stage. Weight of the thyroid reached its highest level at 5% e99 Production stage. The ovary weight was greatly reduced during molting, but started to increase after induced molting until the end of the egg Production Phase (P<0.05). Plasma T3,T4 and cortisol were found to be the highest at the start of the Post-molt Production stage, but reached their minimum at the end Phase of e99 Production. Plasma estradiol was the lowest at the 5% egg Production stage. The Present study demonstrated that molting is a complex Process that require the involvement of endocrine glands to trigger their specific hormones, which play a key role in molt induction.

본 실험은 산란노계에서 강제환우가 갑상선, 난소, 부신의 무게 및 이들 기관에서 분비되는 호르몬 수준의 변화에 미치는 영향을 구명하고자 시행하였다. 77주령 산란계 360수를 10수씩 36개의 펜에 배치하여 7주간 강제환우를 시행하였다. 사료는 단백질 수준이 16%이며 대사에너지가 2,800kca1/kg 함유된 시판용으로 84주령부터 126주까지 급여하였다. 강제환우전, 산란율 5%, 산란피크 및 실험 종료 시에 각각 36수씩 희생시켜 채혈을 하였으며, 갑상선, 난소, 부신의 무게를 측정하였고 혈청에서 T3, T4, cortisol 및 estradiol 함량을 측정하였다. 갑상선의 무게는 산란율이 5%에 도달하였을 때 제일 높게 나타났다 난소의 무게는 강제환우 후에 현저하게 감소되었지만 그 후에 지속적으로 증대되어 실험 종료 시에 극대화 되었다(P<0.05). 산란율이 5%에 도달한 시기에 혈청의 T3, T4 및 cortisol 수준은 다른 시기에 비하여 높게 나타났지만 실험 종료 시에 제일 낮게 나타났다. 혈청의 estradiol은 산란율이 5%에 도달한 시기에 제일 낮았다. 본 실험에서 강제환우 과정에서 환우의 유기에 주요 역할을 하는 내분비 기관 및 이들 기관에서 분비되는 T3, T4, cortisol, estradiol 수준이 복합적으로 관련될 수 있음을 시사하였다.

Keywords

References

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