The Bioscan, 4(4): 607-612, 2009
An International Quarterly Journal of Life Sciences
web site: www.thebioscan.in 
CYCLICAL CHANGES IN THYROID ACTIVITY IN THE FEMALE INDIAN 
EMBALLONURID BAT, TAPHOZOUS LONGIMANUS (HARDWICKE)
A. A. NERKAR 
Department of Zoology, Institute of Science,
R. T. Road, Civil Lines, Nagpur - 440 001, INDIA
E-mail: archana_nerkar1@yahoo.co.in


KEY WORDS
Thyroid
Ovaries
Bat
Body weight
Reproduction
Received on: 17.08.2009 Accepted on: 07.12.2009 *Corresponding Author

ABSTRACT

The present study was designed to investigate changes in thyroid activity during the reproductive cycle in Taphozous longimanus. This bat is a continuous breeder with pregnancies follow in quick succession throughout the year. In the present study, there was a correlation between body, ovary and thyroid weights during estrus and mid-pregnancy. The weight of the thyroid gland is more during pregnancy than the non pregnancy. Thyroid follicles, amount of colloid and epithelial cell height showed a significant variation during different stages of the reproductive cycle. Thyroid gland during estrus showed heterogenous population of follicles. During pregnancy (early and mid-), the thyroid gland contained more or less homogenous population of small to medium sized follicles. At the end of gestation, the large follicles along with medium follicles are also observed in the thyroid gland of late pregnant bat. It is suggested that in T. longimanus thyroid gland is active during early part of pregnancy and thyroid activity decreases at the end of pregnancy as indicated by large follicles in the thyroid gland of pregnant bat.