Jafarzadeh Shirazi Mohammad Reza , Sepehri Hoori , Gheisari Hamid Reza , Effect of Different Phases of Estrous Cycle on Kisspeptin Expression in the Arcuate Nucleus of the Ewe, Journal of Animal and Veterinary Advances, Volume 7,Issue 9, 2008, Pages 1101-1104, ISSN 1680-5593, javaa.2008.1101.1104, (https://makhillpublications.co/view-article.php?doi=javaa.2008.1101.1104) Abstract: Kisspeptin (KP) is a prodct of prepro-kisspeptin. KP is a key regulator of GnRH and LH secretion in the ewe. In this study, Effect of different phases of estrous cycle on kisspeptin expression in the arcuate nucleus of the ewe examined. Because of no difference between phases of cycle, we suggested that perhaps KP neurons involved in mediating of both positive and negative feedback effects of steroids to GnRH neurons. Keywords: Kisspeptin;estrous cycle;arcuate nucleusm ewe;GnRH