Advances in Animal and Veterinary Sciences

Research Article
Adv. Anim. Vet. Sci. 3 (4): 245 - 252
http://dx.doi.org/10.14737/journal.aavs/2015/3.4.245.252
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Amir Hossan Shaikat1*, Md. Ahasanul Hoque2, SKM Azizul Islam1, Mohammad Mahmudul Hassan1, Shahneaz Ali Khan1, AKM Saifuddin1, Mohammad Yousuf1, Md. Al Mamun1, Mohammad Belayet Hossain1

1Department of Physiology, Biochemistry and Pharmacology (DPBP); 2Department of Medicine and Surgery, Chittagong Veterinary and Animal Sciences University (CVASU), Chittagong, Bangladesh.

*Correspondence | Amir Hossan Shaikat, Chittagong Veterinary and Animal Sciences University, Chittagong, Bangladesh; Email: dramir04@gmail.com

Abstract
Sex reversal is evolutionary a rear event in animal and human. To understand the magnitude of occurrence, a total of 28 sex reversed layer chickens were identified in two poultry farms during 2011 over a total population of 3000 layer chickens in Ramu, Cox’s Bazar. The chickens were randomly divided into two equal groups. Case chickens (Group I) were separated from normal chickens for 15 days and were monitored for phenotypic characteristics such as body weight, comb length, comb width, and wattle length. These parameters were measured and compared with the corresponding characteristics of normal chickens. After monitoring period, blood samples were taken from studied chickens, plasma was collected to quantify the sex hormones. Moreover, studied chickens were sacrificed for gross and histopathological examination. Results indicate that case chickens had atrophied ovaries containing seminiferous tubules and Leydig cells. These results were linked with higher plasma testosterone (8.1 ng/ml) and lower estrogen (5 pg/ml) and progesterone concentration (318.1 pg/ml). Case chickens also have spurs, higher body weight, comb length and width, and wattle length. It is likely that farm chickens might have been exposed to nitrobenzene and dichlorodiphenyltrichloroethane, which could lead the formation of Leydig cells in the ovary. The Leydig cell secretes testosterone and subsequently they become high in plasma, causing appearance of secondary sexual characteristics of male in female chickens. The study highlights the important of environmental chemicals on the physic-chemical characteristics in chicken and therefore extreme caution should be practiced to avoid any contact or exposure to animals.

Keywords | Sex reversal, Layer chicken, Arrhenoblastoma, Hormone, Bangladesh