Prehatch Development of Respiratory System in Kuttanad Duck (Anas Platyrhynchos Domesticus).
2016
dar, Firdous ahmad | Krishnan, Maya | Pilli, Ashok Narayan | Baba, M. A. | Khan, Massarat
The pre hatch development of the respiratory system in Kuttanad ducks was studied by using 18 Kuttanad duck embryos collected on 7th, 14th and 21stday of incubation. In order to find out the respiratory primordia and its morphological development, few embryos were also collected from 3rd to 13th day of incubation By 3rd day of incubation in the duck embryo, the olfactory pits were observed at the junction of the lateral and ventral walls of the head and was anterior to the primordia of eyes. By 7thday, the nasal cavity was formed and lined with a pseudostratified columnar epithelium. By 10th day of incubation the individual parts of the respiratory system were clearly observed with the stereozoom microscope. By day 14th day of incubation it was evident that the primary bronchi, secondary bronchi, parabronchi, air sacs and pleura came into existence. By 21st day the parabronchi developed and underwent micro-architectural organization with the cavitation that extended peripherally deep into the surrounding mesenchymal tissue all along the lung parenchyma. The atria and infundibulae were also developed. The development of the respiratory tract in prehatch period in the present study confirmed that the tract is an early maturing system in general and lung in particular.
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