Early embryonic exposure to chlorpyrifos‐cypermethrin combination induces pattern deficits in the heart of domestic hen

2020 ◽  
Author(s):  
Urja Verma ◽  
Kashmira Khaire ◽  
Isha Desai ◽  
Shashikant Sharma ◽  
Suresh Balakrishnan
Keyword(s):  
Embryonic Exposure ◽  
Domestic Hen

EMBRYONIC EXPOSURE TO O,P′-DDT CAUSES EGGSHELL THINNING AND ALTERED SHELL GLAND CARBONIC ANHYDRASE EXPRESSION IN THE DOMESTIC HEN

2006 ◽  
Vol 25 (10) ◽  
pp. 2787 ◽  
Author(s):  
Lena Holm ◽  
Alexandra Blomqvist ◽  
Ingvar Brandt ◽  
Björn Brunström ◽  
Yvonne Ridderstråle ◽  
...  
Keyword(s):  
Carbonic Anhydrase ◽  
Shell Gland ◽  
Embryonic Exposure ◽  
Eggshell Thinning ◽  
Domestic Hen

scholarly journals Embryonic exposure to oestrogen causes eggshell thinning and altered shell gland carbonic anhydrase expression in the domestic hen

Reproduction ◽  
2004 ◽  
Vol 128 (4) ◽  
pp. 455-461 ◽  
Author(s):  
C Berg ◽  
A Blomqvist ◽  
L Holm ◽  
I Brandt ◽  
B Brunström ◽  
...  
Keyword(s):  
Carbonic Anhydrase ◽  
Environmental Concern ◽  
Carbonic Anhydrase Activity ◽  
Shell Gland ◽  
In Ovo ◽  
Functional Disturbance ◽  
Embryonic Exposure ◽  
Eggshell Thinning ◽  
Resistance To Deformation ◽  
Domestic Hen

Eggshell thinning among wild birds has been an environmental concern for almost half a century. Although the mechanisms for contaminant-induced eggshell thinning are not fully understood, it is generally conceived to originate from exposure of the laying adult female. Here we show that eggshell thinning in the domestic hen is induced by embryonic exposure to the synthetic oestrogen ethynyloestradiol. Previously we reported that exposure of quail embryos to ethynyloestradiol caused histological changes and disrupted localization of carbonic anhydrase in the shell gland in the adult birds, implying a functional disturbance in the shell gland. The objective of this study was to examine whether in ovo exposure to ethynyloestradiol can affect eggshell formation and quality in the domestic hen. When examined at 32 weeks of age, hens exposed to ethynyloestradiol in ovo (20 ng/g egg) produced eggs with thinner eggshells and reduced strength (measured as resistance to deformation) compared with the controls. These changes remained 14 weeks later, confirming a persistent lesion. Ethynyloestradiol also caused a decrease in the number of shell gland capillaries and in the frequency of shell gland capillaries with carbonic anhydrase activity. These data suggested that a disrupted carbonic anhydrase expression was involved in the mechanism for the oestrogen-induced eggshell thinning found in this study. The results support our hypothesis that eggshell thinning in avian wildlife can result from a structural and functional malformation in the shell gland, induced by xeno-oestrogen exposure during embryonic development.

Role of magnesium in egg shell formation in the domestic hen

1991 ◽  
Vol 32 (4) ◽  
pp. 853-864 ◽  
Author(s):  
A. L. Waddell ◽  
R. G. Board ◽  
V. D. Scott ◽  
S. G. Tullett
Keyword(s):  
Shell Formation ◽  
Egg Shell ◽  
Domestic Hen
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