Title: Gross and biometrical study on postnatal development of thyroid gland in assam goat (Capra hircus)
Authors: Kamal Sarma, SN Kalita and J Devi
Source: Ruminant Science (2016)-5(1):29-32.
Cite this reference as: Sarma Kamal, Kalita SN and Devi J (2016). Gross and biometrical study on postnatal development of thyroid gland in assam goat (Capra hircus). Ruminant Science 5(1):29-32.
Present study was conducted on eighteen male Assam goats divided into six age groups viz. group-I (0-day), group-II (2 months), group-III (4 months), group-IV (6 months), group-V (8 months) and group-VI (10 months) consisting of three animals in each group. The thyroid gland was composed of right and left lateral lobes connected by a narrow isthmus. The location of the isthmus over the trachea varied and ranged from 4th to 9th tracheal rings. Various biometrical parameters viz. length, width, thickness and weight of the thyroid gland showed a highly significant (P<0.01) increase between various age groups as well as between the thyroid of right and left sides of the body. Accessory thyroid tissue was not observed in any of the male goats. Different biometrical parameters of the isthmus showed an increasing trend with the advancement of age and the variations were found to be highly significant (P<0.01) between various age groups, except in respect of their weight.
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