Eberhard Haase

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P. J. Sharp10
Donald S. Farner8
E Paulke7
Alain Géloen6
Milton H. Stetson6
15M Eens
15A P Møller
15L Z Garamszegi
15S Hurtrez-Boussès
11Maria M Di Fiore

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1945
2012
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The annual reproductive cycle in mallards.
  • E Haase
  • Journal of steroid biochemistry
  • 1983
In wild mallard drakes plasma FSH and LH levels were elevated at the height of the breeding season in spring, decreased towards the end of the reproductive phase and were low during the time of photorefractoriness in summer, when the testes were regressed. In contrast plasma prolactin concentrations increased only towards the end of the breeding season and… (More)
Allometric comparison of brain weight and brain structure volumes in different breeds of the domestic pigeon, Columba livia f.d. (fantails, homing pigeons, strassers).
In three breeds of domestic pigeons (fantails, homing pigeons, and strassers) the volumes of fresh, i.e. unfixed tissue of 14 brain structures were determined (telencephalon, diencephalon, nervus opticus, tectum, cerebellum, tegmentum and hyperstriatum accessorium, hyperstriatum ventrale, neostriatum, paleostriatum, hippocampus, septum, regio… (More)
Investigations of the butylcholinesterase-containing cells of the adenohypophysis of the white-crowned sparrow, Zonotrichia leucophrys gambelii
In the adenohypophysis of Zonotrichia leucophrys gambelii two types of cells with butylcholinesterase(BuChE) activity can be demonstrated histochemically. Type I occurs in the cephalic lobe of the pars distalis and in the pars tuberalis; it consists of oval and round cells. It is a distinctive cell type that is identical with the amphophilic cells described… (More)
Influence of flight on protein catabolism, especially myofilament breakdown, in homing pigeons
In order to study protein degradation during flight in homing, a high-performance liquid chromatography technique was developed for the quantitative analysis of Nτ-methylhistidine. Secondly, it was necessary to confirm that the excretion of Nτ-methylhistidine correlates with myofilament breakdown in homing pigeons. In these experiments, ten birds were… (More)
Effects of flight on blood parameters in homing pigeons
The influence of flight and flight duration on 13 blood parameters was studied in homing pigeons which returned after 2–22 h of flight from release sites 113–620 km away. The haematocrit value decreased from 54.4% in controls to 51.0% in the flown birds. A lowered haematocrit overproportionately improves blood flow. The plasma concentrations of glucose and… (More)
Environmental and hormonal factors in seasonal breeding in free-living male Indian rose-ringed parakeets (Psittacula krameri).
Seasonal changes in testicular activity, plasma luteinizing hormone (LH), estradiol (E2), testosterone (T), and 5 alpha-dihydrotestosterone (5 alpha-DHT) were related to pair bond formation, nest building, nest defense, and parental behavior in free-living Indian rose-ringed parakeets (Psittacula krameri) in northwest India. Spermatozoa production occurred… (More)
Intense flight and endotoxin injection elicit similar effects on leukocyte distributions but dissimilar effects on plasma-based immunological indices in pigeons.
Most birds rely on flight for survival. Yet as an energetically taxing and physiologically integrative process, flight has many repercussions. Studying pigeons (Columba livia) and employing physiological and immunological indices that are relevant to ecologists working with wild birds, we determined what, if any, acute immune-like responses result from… (More)
Effects of seasonal and social factors on testicular activity and hormone levels in domestic pigeons.
Testicular morphology and plasma concentrations of luteinizing hormone (LH), testosterone, progesterone, and estradiol-17beta were compared in paired (n = 8) and unpaired (n = 7) racing pigeons killed in December. The birds were housed mixed together under natural lighting conditions in two unheated lofts which contained no nesting facilities, in Kiel (54… (More)
Seasonal changes in the concentrations of plasma gonadotropins and prolactin in wild mallard drakes.
Seasonal changes in the concentrations of plasma luteinizing hormone (LH), follicle-stimulating hormone (FSH), and prolactin were measured in serial samples taken from seven captive wild mallard drakes exposed to natural lighting and temperature in Kiel, West Germany (54 degrees N), for 20 months. The seasonal pattern of plasma LH levels was characterized… (More)