Distribution and variation in gonadotropin releasing hormone-I (GnRH-I) immunoreactive neurons in the brain of the native Thai chicken during the reproductive cycle

Natagarn Sartsoongnoen, Nattiya Prakobsaeng, Sunantha Kosonsiriluk, Orn Anong Chaiyachet, Duangsuda Chokchaloemwong, Mohamed El Halawani, Yupaporn Chaiseha

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

Gonadotropin releasing hormone-I (GnRH-I) is known to regulate the avian reproductive system. We investigated the roles of GnRH-I in the regulation of the reproductive system of the native Thai chicken. The distribution of GnRH-I neurons and changes in GnRH-I-immunoreactive (-ir) neurons throughout the reproductive stages and between incubating and nest-deprived hens were analyzed utilizing immunohistochemical techniques. The results revealed that GnRH-I-ir neurons were distributed in a discrete region lying close to the third ventricle from the level of preoptic area through the anterior hypothalamus, with the greatest abundance found within the nucleus commissurae pallii (nCPa). The number of GnRH-I-ir neurons in the nCPa was highest in laying hens when compared with that in the other reproductive stages. Nest deprivation caused an increase in the number of GnRH-I-ir neurons in the nCPa of nest-deprived hens when compared with incubating hens. These results indicate that GnRH-I expression is correlated with the reproductive state in the native Thai chicken and may be, in part, regulated by it. This study also confirms a pivotal role of GnRH-I in controlling avian reproduction of this non-seasonal breeding, equatorial species.

Original languageEnglish (US)
Pages (from-to)409-420
Number of pages12
JournalActa Histochemica
Volume114
Issue number5
DOIs
StatePublished - Sep 2012

Bibliographical note

Funding Information:
The authors acknowledge the financial support from Suranaree University of Technology through the Grant for the Promotion of Patent-Oriented Research and International Publications to Y.C. The authors would like to thank the University Farm of Suranaree University of Technology for providing the chicken barns.

Copyright:
Copyright 2013 Elsevier B.V., All rights reserved.

Keywords

  • Birds
  • Gonadotropin releasing hormone-I
  • Hypothalamus
  • Immunohistochemistry
  • Incubation behavior
  • Native Thai chicken
  • Reproductive cycle

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