Influence of hyper-and hypo-corticalism in RIR pullets reared under LD 6:18 on organ growth kinetics and serum hormone profile Dandekar D.S., Devkar R.V., Ramachandran A.V.* Division of Reproductive Biology and Endocrinology, Poultry Section, Department of Zoology, Faculty of Science, The M.S. University of Baroda, Vadodara - 390 002, India. * Corresponding author.
Abstract Present study describes the influence of mild hypercorticalism (HPR) on corticosterone and hypocorticalism (HPO) on metyrapone implantation in RIR pullets reared under a short photoperiod (SP; LD 6:18) during first 90 days of post-hatched development on, histomorphology and hormone of adrenal, thyroid and ovary, and growth rate of adrenal, thyroid, ovary, oviduct, liver and lymphoid organs. The body weight of both, HPR and HPO chicks was significantly greater than the control chicks at 90 days. The organ weights and growth rate of thyroid, adrenal, ovary and oviduct showed significant increment throughout the period of study in HPO chicks while, HPRchicks showed increased weight and growth rate only between 60 and 90 days. Favourable influence of HPR on growth of liver, and that of HPO, on growth of lymphoid organs, is marked by higher relative weight of liver of in HPR chicks, and that of lymphoid organs in HPO chicksat 90 days. The relative level of corticosterone was similar in all the three groups of chicks. However, the serum hormone levels of T3, T4 and progesterone showed significant increment in HPR and HPO chicks. Rate of transition from small to big and big to large follicle was similar in the ovary of all the three groups of chicks. From the present study it can be concluded that there are subtle influences of HPR and HPO under SP on organ weights and serum hormone levels studied and that, these alterations may exert modulatory influence on SP induced intra-ovarian molecular mechanisms. Top Key words RIR Chicks, Photoperiod, hypercorticalism, hypocorticalism, growth kinetics. Top |