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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  

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)
Publication Information
Korean Journal of Poultry Science / v.29, no.4, 2002 , pp. 243-247 More about this Journal
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.
Keywords
induced molting; laying hens; thyroid; ovary; hormone;
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