Ontogeny of a circadian rhythm in the glycaemic response of Gallus domesticus to glucagon |
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| Affiliation: | 1. Division of Nephrology, Department of Internal Medicine, Korea University Medical College, Seoul, Korea;2. Division of Integrative Biosciences and Biotechnology & Department of Life Sciences, Pohang University of Science and Technology (POSTECH), Pohang, Republic of Korea;1. School of Business, Economics & Information Systems, University of Passau, Passau, Germany;2. EcoAustria – Institute for Economic Research, Am Heumarkt 10, 1030 Vienna, Austria;3. Vienna University of Economics and Business (WU), Institute for Regulatory Economics, Welthandelsplatz 1, 1020 Vienna, Austria;1. College of Animal Science, Fujian Agriculture and Forestry University, Fuzhou 350002, People’s Republic of China;2. Fujian Key Laboratory of Traditional Chinese Veterinary Medicine and Animal Health (Fujian Agricultural and Forestry University), Fuzhou 350002, People’s Republic of China |
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| Abstract: | - 1.1. A circadian rhythm in the glucagon-mediated glycogenolytic response was absent in the newly-hatched chick but was present in the bird aged 1 week.
- 2.2. The peak glucose concentration was 38% higher in the afternoon in 1-week-old birds and 50% in 2-week-old birds.
- 3.3. The circadian rhythm was not present in 1-week-old birds subjected to constant illumination from hatching.
- 4.4. Starving the bird reduced the response to glucagon, irrespective of the time of day.
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