A study of the seasonal changes in the thyroid gland of the thirteen-lined ground squirrel (citellus tridecemlineatus), with particular reference to its sexual cycle

1935 ◽  
Vol 62 (2) ◽  
pp. 109-137 ◽  
Author(s):  
Moses Zalesky
Keyword(s):  
Thyroid Gland ◽  
Seasonal Changes ◽  
Ground Squirrel ◽  
Sexual Cycle

scholarly journals Seasonal Changes in Spermatogenesis and Immunolocalization of Inhibin/Activin Subunits in the Wild Male Ground Squirrel (Citellus dauricus Brandt)

2008 ◽  
Vol 54 (6) ◽  
pp. 460-464 ◽  
Author(s):  
Xia SHENG ◽  
Haolin ZHANG ◽  
Wei ZHANG ◽  
Moshi SONG ◽  
Mengyuan ZHANG ◽  
...  
Keyword(s):  
Seasonal Changes ◽  
Ground Squirrel ◽  
Wild Male ◽  
In The Wild

scholarly journals Testicular expression of NGF, TrkA and p75 during seasonal spermatogenesis of the wild ground squirrel (Citellus dauricus Brandt)

2015 ◽  
Vol 59 (3) ◽  
Author(s):  
H. Zhang ◽  
Y. Wang ◽  
J. Zhang ◽  
L. Wang ◽  
Q. Li ◽  
...  
Keyword(s):  
Breeding Season ◽  
Sertoli Cells ◽  
Seasonal Changes ◽  
Ground Squirrel ◽  
Leydig Cells ◽  
Testicular Function ◽  
Nonbreeding Season ◽  
Function Change ◽  
The Mean ◽  
Neuronal Systems

The nerve growth factor (NGF) not only has an essential effect on the nervous system, but also plays an important role in a variety of non-neuronal systems, such as the reproductive system. The aim of this study was to investigate the seasonal changes in<strong> </strong>expression of NGF and its receptors (TrkA and p75) in testes of the wild ground squirrel during the breeding and nonbreeding seasons.<strong> </strong>Immunolocalization for NGF was detected mainly in Leydig cells and Sertoli cells in testes of the breeding and nonbreeding seasons. The immunoreactivity of TrkA was highest in the elongated spermatids, whereas p75 in spermatogonia and spermatocytes in testes of the breeding season. In the nonbreeding season testes, TrkA showed positive immunostainings in Leydig cells, spermatogonia and primary spermatocytes, while p75 showed positive signals in spermatogonia and primary spermatocytes. Consistent with the immunohistochemical results, the mean mRNA and protein level of NGF and TrkA were higher in the testes of the breeding season, and then decreased to a relatively low level in the nonbreeding season. In addition, the concentration of plasma gonadotropins and testosterone were assayed by radioimmunoassay (RIA), and the results showed a significant seasonal change between the breeding and nonbreeding seasons. To conclude, these results of this study provide the first evidence on the potential involvement of NGF and its receptor, TrkA and p75 in the seasonal spermatogenesis and testicular function change of the wild ground squirrel.

Histometrical Changes in the Thyroid Gland of Chabro Chicken Reared during Summer and Winter Seasons

2020 ◽  
Author(s):  
Amit Singh Vishen ◽  
Varsha Gupta ◽  
S.P. Singh ◽  
Abhinov Verma ◽  
Rakesh Kumar Gupta ◽  
...  
Keyword(s):  
Thyroid Gland ◽  
Seasonal Changes ◽  
Squamous Epithelium ◽  
Poultry Farm ◽  
Follicular Cells ◽  
Climatic Variations ◽  
Reticular Fibers ◽  
Poultry Birds ◽  
The Tropics ◽  
Apparently Healthy

Background: Chabro is a strain of poultry birds especially designed for backyard farming and is more adoptive to climatic variations in the tropics. The thyroid gland plays an important role in controlling basal metabolic rate. The histoarchitectural changes of the gland in association with seasonal changes has not been studied so far in Chabro. The present study describes the season related variations in the histometry of thyroid gland.Methods: Micrometrical studies were conducted on thyroid gland of eight to ten weeks old 24 apparently healthy Chabro chickens procured from Poultry Farm, DUVASU, Mathura after approval of CPCSEA. For this study the chickens were divided into two groups consist of 12 chickens in each group reared in summer and winter seasons.Result: Histologically, the thyroid gland was composed of stroma and parenchyma. The capsule had outer thick adipose and inner thin fibrous layers. The follicles were filled with colloid produced by the follicular cells. The percentage of small follicles was more followed by medium and large follicles. The follicles were lined by simple squamous epithelium in summer and cuboidal epithelial cells in winter. All micrometrical parameters, amount of reticular fibers, percentage of large and active follicles were higher in winter.

scholarly journals SEASONAL CHANGES IN THE THYROID GLAND IN THE MALE COBRA,NAJA NAJAL

1969 ◽  
Vol 136 (3) ◽  
pp. 347-354 ◽  
Author(s):  
K. W. CHIU ◽  
J. G. PHILLIPS ◽  
P. F. A. MADERSON
Keyword(s):  
Thyroid Gland ◽  
Seasonal Changes
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