Year: 2016 | Month: April | Volume 6 | Issue 1
Histomorphology of Thyroid Gland and Thyroid Hormonal Changes in Pati ducks (Anas platyrhynchos domesticus) of Assam with Age
Abstract:
The study was conducted on 36 number of Assam Pati ducks divided into 6 groups to study the histomorphological characteristics of thyroid gland and Thyroid hormones from 2 weeks to 40 weeks of age. The thyroid glands were collected from 6 birds in each group. After recording the gross parameter values the material was fixed and processed for histological studies. Blood samples of about 2-3 ml were collected from the wing veins of each bird before sacrifice of each age group and immediately transferred into blood collection tubes without adding any anticoagulant for biochemical study. The paired thyroid glands in the Pati ducks were located on either side of the trachea close to the vascular angle formed by the subclavian artery and common carotid artery. The microscopic structure of thyroid glands of Pati ducks revealed primarily the capsule enclosing the follicles that contained colloid in the H & E sections. The interfollicular area contained the parafollicular cells. A homogenous translucent colloidal mass filled the thyroid follicles in all age groups. C cells were present in the interfollicular zone of the thyroid gland. The average serum triiodothyronine level in 2 weeks old ducks was 2.706 ± 0.049 nmol/L. The mean serum level of thyroxine in 2 weeks old ducklings was 53.981 ± 0.590 nmol/L and in 40 weeks ducks was 71.198 ± 2.337 nmol/L.
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