Hypothalamic monoamine turnover in ring doves (streptopelia risoria), courting,incubating and brooding young |
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| Institution: | 1. Department of Applied Biology, Lancashire Polytechnic, Preston, PR1 2TQ, U.K. (Tel. 0772-201201; Fax. 0772-892903);2. Ciba-Geigy Ltd, R1001, B. 3. 86, 4002 Basle, Switzerland;3. AFRC Institute of Animal Physiology and Genetics Research, The Edinburgh Research Station, Roslin, Midlothian, EH25 9PS, U.K.;1. Department of Aerospace Engineering, GNA University, Phagwara 144 401, India;2. Department of Aerospace Engineering, Lovely Professional University, Phagwara 144 411, India;3. Department of Mathematics, Lovely Professional University, Phagwara 144 411, India;1. University of Rostock, Institute of Biological Sciences, Marine Biology, Albert-Einstein-Straße 3, D-18059, Rostock, Germany;2. Leibniz Institute for Baltic Sea Research Warnemünde, Seestrasse 15, D-18119, Rostock, Germany;3. Royal Netherlands Institute for Sea Research (NIOZ), Department of Estuarine and Delta Systems, and Utrecht University, Korringaweg 7, 4401, NT, Yerseke, Netherlands;1. Laboratoire des Aeronefs, University of Blida 1, Blida, Algeria;2. Department of Materials Science & Engineering, Drexel University, Philadelphia, United States;3. Laboratoire des Sciences et Genie des Materiaux, University of Babezouar, Algiers, Algeria;4. Center of Research Technology Industrial, CRTI, Algiers, Algeria;5. Laboratoire Physique Fund. et Appliqué, University of Blida 1, Blida, Algeria;1. College of Veterinary Medicine, Jilin University, Changchun, Jilin 130062, China;2. Division of Swine Infectious Diseases, State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin 150000, China;3. Key Laboratory for Zoonosis, Ministry of Education, Changchun 130062, China |
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| Abstract: | 1. The turnovers of hypothalamic 5-hydroxytryptamine (5HT), dopamine (DA) and noradrenaline (NE) were measured in male and female ring doves (Streptopelia risoria) at three stages of the breeding cycle: courtship, 3 days after pairing; early incubation, 1–2 days after egg laying; and brooding, 1–3 days after the squabs had hatched.2. In both sexes plasma LH decreased progressively from courtship through incubation to brooding young. Crop sacs were fully developed in doves brooding young but not at other stages of the reproductive cycle, indicating increased concentrations of plasma prolactin.3. The turnovers of 5HT and DA in both sexes were significantly higher (P<0.001) in doves brooding young than in birds incubating eggs or nest building. The turnover of DA was higher in females than in males at the onset of incubation. The turnover of NE was lower (P > 0.01) in females at the onset of incubation than during courtship or brooding.4. Increased turnover of hypothalamic DA may be more closely related to brooding behaviour than to changes in prolactin or LH secretion.5. Increased hypothalamic 5HT turnover in brooding doves appears to be more directly related to crop sac development, and by inference increased prolactin secretion, than to depressed plasma LH concentrations. |
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