Effect of Epinephrine and Bromocriptine on Ovary Folliculogenesis and Productive Traits of Laying Hens

Document Type : Short Communication


Department of Animal Science, Faculty of Agriculture, University of Jiroft, Jiroft, Iran


An experiment was conducted to study the effect of Epinephrine (EP) and bromocriptine (BR) on productive traits of laying hens. Thirty White Leghorn hens, 50 weeks old, were divided into three equal treatments (with 10 hens for each treatment): control, physiological serum (0.5 mL/hen/week), EP (0.5 mL/hen/week) and BR (100 g/kg of body weight (BW); w/v in absolute alcohol). Hens were injected once a week for 10 weeks. At the end of the experimental period, all hens were killed by decapitation. Ovaries, oviducts and ovarian follicles were examined. Ovary folliculogenesis was affected (P<0.01) by EP and BR treatments. There were larger yellow follicle (LYF), smaller yellow follicle (SYF) and larger white follicle in EP and BR treated hens compared to control group respectively. EP and BR treatments shortened total pause length compared to control (P<0.01). Mean weekly egg production was higher (P<0.01) for treated hens with BR and EP compared to control group. Percentage of weekly egg production was higher (P<0.01) in treated birds compared to control group. It can be concluded that EP and BR may promote ovarian follicular development and stimulate ovulation in laying hens at the end of their reproductive cycle.


Camper P.M. and Burke W.H. (1977). Effects of prolactin on the gonadotropin induced rise in serum oestradiol and progesterone in the laying turkey. Gen. Comp. Endocrinol. 32, 72-77.
Denno K.M., McCorkle F.M. and Taylor R.L. (1994). Catecholamines modulate chicken immunoglobulin M and immunoglobulin G plaque forming cells. Poult. Sci. 73, 1858-1866.
Ebeid T.A., Eid Y.Z., El Abd E.A. and Habbak M.M. (2008). Effects of catecholamines on ovary morphology, blood concentrations of estradiol-17b, progesterone, zinc, triglycerides and rate of ovulation in domestic hens. Theriogenology. 69, 870-876.
Gilbert A.B. (1969). Innervation of the ovary of the domestic hen. Exp. Physiol. 54, 404-415.
Lea R.W., Dods A.S.M., Sharp P.J. and Chadwick A. (1981). The possible role of prolactin in the regulation of nesting behaviour and the secretion of luteinizing hormone in broody bantams. J. Endocrinol. 91, 89-97.
Li W.L., Liu Y., Yu Y.C., Huang Y.M., Liang S.D. and Shi Z.D. (2011). Prolactin plays a stimulatory role in ovarian follicular development and egg laying in chicken hens. Domest. Anim. Endocrinol. 41, 57-66.
Reddy I.J., David C.G. and Raju S.S. (2007). Effect of suppression of plasma prolactin on luteinizing hormone concentration, intersequence pause days and egg production in domestic hen. Domest. Anim. Endocrinol. 33, 167-175.
Reddy I.J., David C.G. and Singh K. (2005). Relationship between intersequence pauses, laying persistency and concentration of prolactin during productive period in White Leghorn hens. Asian-australs J. Anim. Sci. 18, 686-691.
Reddy I.J., David C.G., Sarma P.V. and Singh K. (2001). Prolactin hormone and inter sequence pause days in domestic chicken. Vet. Rec. 149, 590-592.
Renema R.A., Robinson F.E., Melnychuk V.L., Hardin R.T., Bagley L.G., Emmerson D.A. and Blackman J.R.B. (1995). The use of feed restriction for improving reproductive traits in male-line large white turkey hens. 2. Ovary morphology and laying trait characteristics. Poult. Sci. 74, 102-120.
SASInstitute. (1996). SAS®/STAT Software, Release 8. SAS Institute, Inc., Cary, NC.
Sharp P.J., Dawson A. and Lea R.W. (1998). Control of leuteinizing hormone and prolactin secretion in birds. Comp. Biochem. Physiol. C Pharmacol. Toxicol. Endocrinol. 119, 275-282.
Sharp P.J., Sterling R.J., Talbout R.T. and Huskisson N.S. (1989). The role of hypothalamic vasoactive intestinal polypeptide in the maintenance of prolactin secretion in incubating bantam hens. J. Endocrinol. 122, 5-13.
Wolfenson D., Frei Y.F. and Berman A. (1982). Responses of the reproductive vascular system during the egg formation cycle of the unanaesthetised laying hen. Br. Poult. Sci. 23, 425-431.
Yang P.X., Cheng Z.Y., Watanabe G. and Taya K. (2000). Effects of third ventricle injection of norepinephrine analogue on LH secretion of the nonlaying SIJI goose. J. Endocrinol. 47, 7-12.