Role of thyroid in sexual and body weight cycles of the migratory redheaded bunting, Emberiza bruniceps

General and Comparative Endocrinology
P Lal

Abstract

In the male redheaded bunting, Emberiza bruniceps, kept under natural lighting in northern India (Lat 25 degrees 18'N, Long 83 degrees 01'E), testicular growth began during March/April and full spermatogenesis was achieved in May/June; thereafter, the testes regressed and remained regressed for the rest of the year. Thyroidectomy between November and April partially suppressed photoinduced testicular growth in May/June, but did not prevent testicular regression in July. The extent to which thyroidectomy suppressed photoinduced testicular growth was directly related to the time elapsed between thyroidectomy and photostimulation. Thyroidectomy in mid-late May induced testicular regression, an effect which was reversed by daily im injection of 500-2000 ng thyroxine/bird/day/30 days. Thyroidectomy or treatment of intact or thyroidectomized birds between July and March when the testes were regressed had no immediate effect on testicular growth. Body weight which was about 24 g between December and March, increased to about 28 g during the breeding season. Thereafter, it decreased to 21-22 g between August and October. Thyroidectomy between November and May caused an immediate fall in body weight, an effect which was reversed by dail...Continue Reading

References

Nov 1, 1979·General and Comparative Endocrinology·C M Chaturvedi, J P Thapliyal
Mar 1, 1972·The Journal of Experimental Zoology·A S Wieselthier, A Van tienhoven
Oct 1, 1984·General and Comparative Endocrinology·J P Thapliyal, P Lal
Nov 1, 1983·General and Comparative Endocrinology·C M Chaturvedi, J P Thapliyal
Jun 1, 1984·General and Comparative Endocrinology·K A Stokkan, P J Sharp
Sep 1, 1982·General and Comparative Endocrinology·P Lal, J P Thapliyal
Sep 1, 1982·General and Comparative Endocrinology·P Lal, J P Thapliyal
Oct 1, 1980·General and Comparative Endocrinology·C M Chaturvedi, J P Thapliyal

❮ Previous
Next ❯

Citations

Dec 17, 2005·Journal of Experimental Zoology. Part A, Comparative Experimental Biology·C M ChaturvediP Kumar

❮ Previous
Next ❯

Related Concepts

Trending Feeds

COVID-19

Coronaviruses encompass a large family of viruses that cause the common cold as well as more serious diseases, such as the ongoing outbreak of coronavirus disease 2019 (COVID-19; formally known as 2019-nCoV). Coronaviruses can spread from animals to humans; symptoms include fever, cough, shortness of breath, and breathing difficulties; in more severe cases, infection can lead to death. This feed covers recent research on COVID-19.

Blastomycosis

Blastomycosis fungal infections spread through inhaling Blastomyces dermatitidis spores. Discover the latest research on blastomycosis fungal infections here.

Nuclear Pore Complex in ALS/FTD

Alterations in nucleocytoplasmic transport, controlled by the nuclear pore complex, may be involved in the pathomechanism underlying multiple neurodegenerative diseases including Amyotrophic Lateral Sclerosis and Frontotemporal Dementia. Here is the latest research on the nuclear pore complex in ALS and FTD.

Applications of Molecular Barcoding

The concept of molecular barcoding is that each original DNA or RNA molecule is attached to a unique sequence barcode. Sequence reads having different barcodes represent different original molecules, while sequence reads having the same barcode are results of PCR duplication from one original molecule. Discover the latest research on molecular barcoding here.

Chronic Fatigue Syndrome

Chronic fatigue syndrome is a disease characterized by unexplained disabling fatigue; the pathology of which is incompletely understood. Discover the latest research on chronic fatigue syndrome here.

Evolution of Pluripotency

Pluripotency refers to the ability of a cell to develop into three primary germ cell layers of the embryo. This feed focuses on the mechanisms that underlie the evolution of pluripotency. Here is the latest research.

Position Effect Variegation

Position Effect Variagation occurs when a gene is inactivated due to its positioning near heterochromatic regions within a chromosome. Discover the latest research on Position Effect Variagation here.

STING Receptor Agonists

Stimulator of IFN genes (STING) are a group of transmembrane proteins that are involved in the induction of type I interferon that is important in the innate immune response. The stimulation of STING has been an active area of research in the treatment of cancer and infectious diseases. Here is the latest research on STING receptor agonists.

Microbicide

Microbicides are products that can be applied to vaginal or rectal mucosal surfaces with the goal of preventing, or at least significantly reducing, the transmission of sexually transmitted infections. Here is the latest research on microbicides.