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Horm Metab Res 1988; 20(5): 271-273
DOI: 10.1055/s-2007-1010813
ORIGINALS

© Georg Thieme Verlag, Stuttgart · New York

Flight Effects on Plasma Levels of Free Fatty Acids, Growth Hormone and Thyroid Hormones in Homing Pigeons

T. M. John1 , M. Viswanathan1 , J. C. George1 , C. G. Scanes2
  • 1Department of Zoology, University of Guelph, Guelph, Ontario, Canada
  • 2Department of Animal Sciences, Rutgers, The State University, New Brunswick, New Jersey, U.S.A.
Further Information

Publication History

1987

1987

Publication Date:
14 March 2008 (online)

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Summary

Significant increases in circulating levels of free fatty acids (FFA) and growth hormone (GH), were observed in homing pigeons after a flight of 48 km, lasting 60-80 min. No significant change in plasma levels of thyroxine (T4) and triiodothyronine (T3) was observed. Nor was there any change in T3/T4 ratio. The increase in plasma FFA is attributed to the increased release into circulation of at least one adipokinetic hormone, GH. It may be concluded that in free sustained homing flight under normal weather conditions and within the specific distance and duration, metabolic fuel and hormonal homeostasis is maintained.

Key-Words

Homing Flight - Blood Values - Free Fatty Acids - Growth Hormone - Thyroxine - Triiodothyronine